Kapt: Simplify wrapper tests

(cherry picked from commit 1677984)

plugins/annotation-processing/testData/wrappers/javaWrappers/EnumClass.kt

@@ -0,0 +1,17 @@
+// FQNAME: EnumClass
+
+// FILE: EnumClass.java
+enum EnumClass {
+    RED, GREEN, BLUE;
+
+    void someMethod() {
+        System.out.println("Hello, world!")
+    }
+
+    String getStringRepresentation() {
+        return this.toString();
+    }
+}
+
+// FILE: Anno.kt
+annotation class Anno