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

#KT-11807 Fixed

idea/testData/intentions/implementAbstractMember/function/enumClassWithSemicolonAndMembers.kt.after

@@ -8,7 +8,7 @@ enum class E : T<Int> {
     A, B, C;
 
     override fun foo(x: Int): Int {
-        throw UnsupportedOperationException()
+        throw UnsupportedOperationException("not implemented") //To change body of created functions use File | Settings | File Templates.
     }
 
     val bar = 1