"tiny gui support"-removal part 5

Make the unit tests compile again. There seem to be no regressions but
hard to say since the tests are broken at the moment.

src/tests/gui/test_gui2.cpp

@@ -149,7 +149,6 @@ void test()
 		gui2::new_widgets = true;
 	}
 }
-#endif
 
 } // namespace