Correct completion after "super."

#KT-8406 Fixed

idea/idea-completion/testData/handlers/basic/SuperMethod.kt

@@ -0,0 +1,11 @@
+open class Base {
+    open fun foo(p: Int){}
+}
+
+class Derived : Base() {
+    override fun foo(p: Int) {
+        super.<caret>
+    }
+}
+
+// ELEMENT: foo