Add missing ignores for textScaleFactor deprecation (flutter#4239)

flutter/packages#4209 missed a few deprecations since it was reformatted and the "ignore" was placed on the incorrect lines. 

Now `dart analyze --fatal-infos` says no issues found.

Author: LongCatIsLooong

packages/flutter_markdown/lib/src/builder.dart

@@ -829,17 +829,17 @@ class MarkdownBuilder implements md.NodeVisitor {
     if (selectable) {
       return SelectableText.rich(
         text!,
-        textScaleFactor:
-            styleSheet.textScaleFactor, // ignore: deprecated_member_use
+        // ignore: deprecated_member_use
+        textScaleFactor: styleSheet.textScaleFactor,
         textAlign: textAlign ?? TextAlign.start,
         onTap: onTapText,
         key: k,
       );
     } else {
       return RichText(
         text: text!,
-        textScaleFactor:
-            styleSheet.textScaleFactor!, // ignore: deprecated_member_use
+        // ignore: deprecated_member_use
+        textScaleFactor: styleSheet.textScaleFactor!,
         textAlign: textAlign ?? TextAlign.start,
         key: k,
       );

packages/flutter_markdown/test/text_scale_factor_test.dart

@@ -36,8 +36,8 @@ void defineTests() {
         await tester.pumpWidget(
           boilerplate(
             const MediaQuery(
-              data: MediaQueryData(
-                  textScaleFactor: 2.0), // ignore: deprecated_member_use
+              // ignore: deprecated_member_use
+              data: MediaQueryData(textScaleFactor: 2.0),
               child: MarkdownBody(
                 data: data,
               ),
@@ -57,8 +57,8 @@ void defineTests() {
         await tester.pumpWidget(
           boilerplate(
             const MediaQuery(
-              data: MediaQueryData(
-                  textScaleFactor: 2.0), // ignore: deprecated_member_use
+              // ignore: deprecated_member_use
+              data: MediaQueryData(textScaleFactor: 2.0),
               child: MarkdownBody(
                 data: data,
                 selectable: true,
@@ -69,8 +69,8 @@ void defineTests() {
 
         final SelectableText selectableText =
             tester.widget(find.byType(SelectableText));
-        expect(selectableText.textScaleFactor,
-            2.0); // ignore: deprecated_member_use
+        // ignore: deprecated_member_use
+        expect(selectableText.textScaleFactor, 2.0);
       },
     );
   });