fixing a not working controls when compiled without opencv

 This version is a hotfix that get the control working properly again.
 Before the line that checked if sdl is available actually checked if
 for opencv. This broke the builds that used sdl2 without compiling the
 opencv code.
 Because of the size and the importance of this fix, this will be a
 new patch release version.
3 jobs for main in 3 minutes and 36 seconds (queued for 1 second)