Fix false-positive snapshot mismatch

Same reason why jest can fail with "could not find all inline snapshots".
Since we don't need "done()" on async tests we can safely remove it.

Author: eps1lon

packages/react-devtools-shared/src/__tests__/inspectedElement-test.js

@@ -1168,7 +1168,7 @@ describe('InspectedElement', () => {
     done();
   });
 
-  it('should not dehydrate nested values until explicitly requested', async done => {
+  it('should not dehydrate nested values until explicitly requested', async () => {
     const Example = () => {
       const [state] = React.useState({
         foo: {
@@ -1354,11 +1354,9 @@ describe('InspectedElement', () => {
         },
       ]
     `);
-
-    done();
   });
 
-  it('should dehydrate complex nested values when requested', async done => {
+  it('should dehydrate complex nested values when requested', async () => {
     const Example = () => null;
 
     const container = document.createElement('div');
@@ -1446,11 +1444,9 @@ describe('InspectedElement', () => {
         },
       }
     `);
-
-    done();
   });
 
-  it('should include updates for nested values that were previously hydrated', async done => {
+  it('should include updates for nested values that were previously hydrated', async () => {
     const Example = () => null;
 
     const container = document.createElement('div');
@@ -1637,11 +1633,9 @@ describe('InspectedElement', () => {
         },
       }
     `);
-
-    done();
   });
 
-  it('should not tear if hydration is requested after an update', async done => {
+  it('should not tear if hydration is requested after an update', async () => {
     const Example = () => null;
 
     const container = document.createElement('div');
@@ -1748,8 +1742,6 @@ describe('InspectedElement', () => {
         },
       }
     `);
-
-    done();
   });
 
   it('should inspect hooks for components that only use context', async done => {

packages/react-devtools-shared/src/__tests__/legacy/inspectElement-test.js

@@ -143,7 +143,7 @@ describe('InspectedElementContext', () => {
     done();
   });
 
-  it('should support complex data types', async done => {
+  it('should support complex data types', async () => {
     const Immutable = require('immutable');
 
     const Example = () => null;
@@ -241,8 +241,8 @@ describe('InspectedElementContext', () => {
           "preview_long": DataView(3),
         },
         "date": Dehydrated {
-          "preview_short": Wed Dec 31 1969 19:00:00 GMT-0500 (Eastern Standard Time),
-          "preview_long": Wed Dec 31 1969 19:00:00 GMT-0500 (Eastern Standard Time),
+          "preview_short": Thu Jan 01 1970 01:00:00 GMT+0100 (Central European Standard Time),
+          "preview_long": Thu Jan 01 1970 01:00:00 GMT+0100 (Central European Standard Time),
         },
         "fn": Dehydrated {
           "preview_short": ƒ exampleFunction() {},
@@ -325,8 +325,6 @@ describe('InspectedElementContext', () => {
         },
       }
     `);
-
-    done();
   });
 
   it('should support objects with no prototype', async done => {
@@ -574,7 +572,7 @@ describe('InspectedElementContext', () => {
     done();
   });
 
-  it('should not dehydrate nested values until explicitly requested', async done => {
+  it('should not dehydrate nested values until explicitly requested', async () => {
     const Example = () => null;
 
     act(() =>
@@ -670,8 +668,6 @@ describe('InspectedElementContext', () => {
         },
       }
     `);
-
-    done();
   });
 
   it('should enable inspected values to be stored as global variables', () => {