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

#KT-11807 Fixed

idea/testData/codeInsight/generate/testFrameworkSupport/junit3/testMethod.kt.after

@@ -4,6 +4,6 @@ import junit.framework.TestCase
 
 class A : TestCase() {
     fun testName() {
-        throw UnsupportedOperationException()
+        throw UnsupportedOperationException("not implemented") //To change body of created functions use File | Settings | File Templates.
     }
 }