Changed extension in parsing test data (jet -> kt)

compiler/testData/psi/examples/priorityqueues/PriorityQueueAsPushPop.kt

@@ -0,0 +1,7 @@
+class PriorityQueueAsPushPop<T>(wrapped : IPriorityQueue<T>) : IPushPop<T> {
+  override fun pop() = wrapped.extract()
+  override fun push(item : T) = wrapped.add(item)
+  override val isEmpty
+    get() = wrapped.isEmpty
+
+}