fix completion test expectation for fasta scanner

pkg/analyzer_plugin/test/src/utilities/completion/completion_target_test.dart

Index: pkg/analyzer_plugin/test/src/utilities/completion/completion_target_test.dart
diff --git a/pkg/analyzer_plugin/test/src/utilities/completion/completion_target_test.dart b/pkg/analyzer_plugin/test/src/utilities/completion/completion_target_test.dart
index 92a29a85af732982d0344835fbf71e828d73721b..a55537357ed0a40309985b63d7389480fc4f49e4 100644
--- a/pkg/analyzer_plugin/test/src/utilities/completion/completion_target_test.dart
+++ b/pkg/analyzer_plugin/test/src/utilities/completion/completion_target_test.dart
@@ -377,7 +377,8 @@ class CompletionTargetTest extends AbstractContextTest {
   test_MapLiteralEntry() async {
     // MapLiteralEntry  MapLiteral  VariableDeclaration
     await addTestSource('foo = {^');
-    await assertTarget(' : ', '{ : }');
+    // fasta scanner inserts synthetic closing '}'
+    await assertTarget('}', '{}');
   }
 
   test_MapLiteralEntry1() async {