[IR] update testdata: super and receiver for field accesses

compiler/testData/ir/irText/expressions/setFieldWithImplicitCast.kt.txt

@@ -8,7 +8,7 @@ class Derived : Base {
   fun setValue(v: Any) {
     when {
       v is String -> { // BLOCK
-        #value = v /*as String */
+        <this>super.#value = v /*as String */
       }
     }
   }