command/e2etest: fix TestPrimarySeparatePlan test

In 6712192724 we stopped counting data
source destroys in the destroy tally since they are an implementation
detail.

This caused this test to start failing, though since the new behavior is
correct here we just update the test to match.

command/e2etest/primary_test.go

@@ -109,8 +109,8 @@ func TestPrimarySeparatePlan(t *testing.T) {
 		t.Fatalf("unexpected destroy error: %s\nstderr:\n%s", err, stderr)
 	}
 
-	if !strings.Contains(stdout, "Resources: 2 destroyed") {
-		t.Errorf("incorrect destroy tally; want 2 destroyed:\n%s", stdout)
+	if !strings.Contains(stdout, "Resources: 1 destroyed") {
+		t.Errorf("incorrect destroy tally; want 1 destroyed:\n%s", stdout)
 	}
 
 	state, err = tf.LocalState()