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

#KT-11807 Fixed

idea/testData/codeInsight/overrideImplement/doNotOverrideFinal.kt.after

@@ -23,7 +23,7 @@ class C : B(), I {
     }
 
     override fun g() {
-        throw UnsupportedOperationException()
+        throw UnsupportedOperationException("not implemented") //To change body of created functions use File | Settings | File Templates.
     }
 
     override fun hashCode(): Int {