Mark required call with 'caret' in abstract resolved calls test

compiler/testData/resolvedCalls/hasBothThisObjectAndReceiverArgument.kt

@@ -1,5 +1,3 @@
-// !CALL: foo
-
 class A {
     fun B.foo() {}
 }
@@ -8,7 +6,7 @@ trait B
 
 fun bar(a: A, b: B) {
     with (a) {
-        b.foo()
+        b.<caret>foo()
     }
 }