Simplify the kernel change check and make it work with any kernel

Closes #3785

bin/omarchy-update-restart

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-if [ "$(uname -r | sed 's/-arch/\.arch/')" != "$(pacman -Q linux | awk '{print $2}')" ]; then
+if [ ! -d "/usr/lib/modules/$(uname -r)" ]; then
   gum confirm "Linux kernel has been updated. Reboot?" && omarchy-cmd-reboot
 elif [ -f "$HOME/.local/state/omarchy/reboot-required" ]; then
   gum confirm "Updates require reboot. Ready?" && omarchy-cmd-reboot