Do not suggest "add inner" quick fix for interfaces etc. #KT-18396 Fixed

idea/testData/quickfix/modifiers/nestedDataClass.kt

@@ -0,0 +1,9 @@
+// "Add 'inner' modifier" "false"
+// ACTION: Create test
+// ERROR: Class is not allowed here
+// ERROR: Data class must have at least one primary constructor parameter
+class A() {
+    inner class B() {
+        data class <caret>C
+    }
+}