Remove a test for prefer_interpolation_to_compose_strings lint fix.

The lint is not reported after the linter roll.
https://github.com/dart-lang/linter/issues/2490

TBR

Change-Id: I29158445b1395f2bd135d4c67b9322f39eb66fd6
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/189020
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
diff --git a/pkg/analysis_server/test/src/services/correction/fix/replace_with_interpolation_test.dart b/pkg/analysis_server/test/src/services/correction/fix/replace_with_interpolation_test.dart
index 0a630e7..0a2539b 100644
--- a/pkg/analysis_server/test/src/services/correction/fix/replace_with_interpolation_test.dart
+++ b/pkg/analysis_server/test/src/services/correction/fix/replace_with_interpolation_test.dart
@@ -124,14 +124,6 @@
 ''');
   }
 
-  Future<void> test_stringLiteral_variable_raw_single_notMulti() async {
-    await resolveTestCode('''
-var b = 'b';
-var c = r'a' + b;
-''');
-    await assertNoFix();
-  }
-
   Future<void> test_stringLiteral_variable_withEscapes() async {
     await resolveTestCode(r'''
 var b = 'b';