rofi: Fix powermenu hibernation

Forgot to uncomment the actual hibernation command after debugging the
powermenu last time. Now it actually does what it's supposed to again.

rofi/.config/rofi/modes/powermenu

@@ -68,7 +68,7 @@ case "$*" in
 "Suspend" | "$suspend_btn")
     if [ -n "$ROFI_POWERMENU_SUSPEND_CMD" ]; then eval "$ROFI_POWERMENU_SUSPEND_CMD"; else
         lockscreen rofi </dev/null >/dev/null 2>/dev/null &
-        # systemctl hibernate
+        systemctl hibernate
     fi
     ;;
 esac