Kotlin: Add FP test case for useless parameter query

java/ql/test/kotlin/query-tests/UselessParameter/Test.kt

@@ -19,3 +19,6 @@ object O {}
 fun C.fn() {}
 fun C.Companion.fn() {}
 fun O.fn() {}
+
+@Suppress("UNUSED_PARAMETER")
+fun fn2(a: Int) {}

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

@@ -1,2 +1,3 @@
 | Test.kt:11:8:11:18 | a | The parameter 'a' is never used. |
 | Test.kt:19:5:19:5 | <this> | The parameter '<this>' is never used. |
+| Test.kt:24:9:24:14 | a | The parameter 'a' is never used. |