Override/Implement: Use function body template when generating functions with default body

#KT-11807 Fixed

idea/testData/codeInsight/overrideImplement/privateJavaMethod/foo/Impl.kt.after

@@ -20,6 +20,6 @@ class C : A(), I {
     }
 
     override fun z() {
-        throw UnsupportedOperationException()
+        throw UnsupportedOperationException("not implemented") //To change body of created functions use File | Settings | File Templates.
     }
 }