Kotlin: add useless parameter test for generic override

Author: tamasvajk

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

@@ -0,0 +1,9 @@
+interface A<T, V> {
+    fun setValue(a: T, b: V)
+}
+
+class B : A<B, Int> {
+    override fun setValue(a: B, b: Int) {
+        println("a")
+    }
+}

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

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

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

@@ -0,0 +1 @@
+DeadCode/UselessParameter.ql