graphics: restore monitor settings when fullscreen is lost then restored (#664)

## Link to GitHub Issue or related Pull Request, if one exists
Fixes #663 

## Description of change
Apply monitor rotation and refresh rate again when fullscreen focus is
regained.

## Testing
Tested with sdvx7

src/spice2x/launcher/shutdown.cpp

@@ -7,6 +7,7 @@
 #include "easrv/easrv.h"
 #include "rawinput/rawinput.h"
 #include "hooks/audio/audio.h"
+#include "hooks/graphics/graphics.h"
 #include "util/deferlog.h"
 #include "util/logging.h"
 
@@ -22,6 +23,9 @@ namespace launcher {
         // therefore, subsystems need to be guarded against multiple unload attempts
         log_info("launcher", "stopping subsystems");
 
+        // reset monitor settings
+        reset_monitor_on_exit();
+
         // before shutting down logger, dump any deferred log messages
         deferredlogs::dump_to_logger();