Misc: Use TODO() consistently in implementation stubs

#KT-13589 Fixed

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

@@ -9,7 +9,7 @@ class Container {
 
     class BaseImpl : Base {
         override var z: Double
-            get() = throw UnsupportedOperationException()
+            get() = TODO("not implemented") //To change initializer of created properties use File | Settings | File Templates.
             set(value) {
             }
     }