add assist association for curly_braces_in_flow_control_structures

See: https://github.com/dart-lang/linter/issues/1374

Change-Id: I151170ee2374a726dc6be037b25e1c7a54729bec
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/115266
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Phil Quitslund <[email protected]>

Author: pq

pkg/analysis_server/lib/src/services/correction/assist.dart

@@ -232,6 +232,9 @@ class DartAssistKind {
       'dart.assist.surround.tryFinally', 29, "Surround with 'try-finally'");
   static const SURROUND_WITH_WHILE = const AssistKind(
       'dart.assist.surround.while', 24, "Surround with 'while'");
-  static const USE_CURLY_BRACES =
-      const AssistKind('USE_CURLY_BRACES', 30, "Use curly braces");
+  static const USE_CURLY_BRACES = const AssistKind(
+      'USE_CURLY_BRACES', 30, "Use curly braces",
+      associatedErrorCodes: <String>[
+        'curly_braces_in_flow_control_structures',
+      ]);
 }