don't add annotation attribute braces when typing comma inside string (IDEA-177182)

java/java-tests/testData/codeInsight/typing/commaInDefaultAnnotationStringArgumentWhenArrayIsExpected_after.java

@@ -0,0 +1,4 @@
+public @interface Category {
+  String[] value();
+}
+@Category("foo,<caret>")

java/java-tests/testData/codeInsight/typing/commaInDefaultAnnotationStringArgumentWhenArrayIsExpected_before.java

@@ -0,0 +1,4 @@
+public @interface Category {
+  String[] value();
+}
+@Category("foo<caret>")