Fix hyprctl crash when screensaver is terminated (#4045)

Redirect hyprctl output in exit_screensaver() to prevent SIGABRT crash
when the screensaver window is closed externally (via keybind or lock screen).

The crash occurs because hyprctl's std::println() throws when writing to
a broken stdout after the terminal is killed.

bin/omarchy-cmd-screensaver

@@ -7,7 +7,7 @@ screensaver_in_focus() {
 }
 
 exit_screensaver() {
-  hyprctl keyword cursor:invisible false
+  hyprctl keyword cursor:invisible false &>/dev/null || true
   pkill -x tte 2>/dev/null
   pkill -f org.omarchy.screensaver 2>/dev/null
   exit 0