Kotlin: Respect override modifier in useless parameter query

java/ql/lib/semmle/code/java/deadcode/DeadCode.qll

@@ -302,6 +302,8 @@ class RootdefCallable extends Callable {
     exists(MemberRefExpr mre | mre.getReferencedCallable() = this)
     or
     this.getAnAnnotation() instanceof OverrideAnnotation
+    or
+    this.hasModifier("override")
   }
 }
 

java/ql/test/kotlin/query-tests/UselessParameter/UselessParameter.expected

@@ -1,2 +0,0 @@
-| Test.kt:6:27:6:30 | a | The parameter a is unused. |
-| Test.kt:6:33:6:38 | b | The parameter b is unused. |