Remove comments from function/property implementation template

#KT-18539 Fixed

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

@@ -6,6 +6,6 @@ open class A {
 
 class B: A() {
     override fun Int.foo(): Int {
-        <selection><caret>TODO("not implemented") //To change body of created functions use File | Settings | File Templates.</selection>
+        <selection><caret>TODO("Not yet implemented")</selection>
     }
 }