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

#KT-11807 Fixed

idea/testData/quickfix/implement/sealedWithConflict.kt.after

@@ -10,7 +10,7 @@ sealed class Base {
 
     class BaseImpl1 : Base() {
         override fun foo(): Int {
-            throw UnsupportedOperationException()
+            throw UnsupportedOperationException("not implemented") //To change body of created functions use File | Settings | File Templates.
         }
     }
 }