core: Fix TestContext2Apply_targetedWithTaintedInState

Tainted objects now also remember which provider they belong to (via the
resource state they are attached to) and so the stringified state output
here is slightly different.

terraform/context_apply_test.go

@@ -8827,6 +8827,7 @@ aws_instance.iambeingadded:
   provider = provider.aws
 aws_instance.ifailedprovisioners: (tainted)
   ID = ifailedprovisioners
+  provider = provider.aws
 		`)
 	if actual != expected {
 		t.Fatalf("expected state: \n%s\ngot: \n%s", expected, actual)