fix: check literal sources list only in test

The literal sources list is the only bit that interests us in this test. Based
on that premise, test that this piece in the actual result is equal to what we
expected it to be.

kustomize/commands/internal/util/configmapSecretFlagsAndArgs_test.go

@@ -311,7 +311,7 @@ func TestUpdateLiteralSources(t *testing.T) {
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
 			tc.wantErr(t, UpdateLiteralSources(tc.args, tc.flags))
-			require.Equal(t, tc.expectedArgs, tc.args)
+			require.Equal(t, tc.expectedArgs.LiteralSources, tc.args.LiteralSources)
 		})
 	}
 }