cups: Remove 5 minutes delay in start_service line in install.sh paks file

cups: Remove 5 minutes delay in start_service line in install.sh paks file

- When cups is installed (including when doing a Core Update that includes a cups update)
   the 5 min delay for starting cups means that it has not restarted by the time that the
   reboot for the CU has been started. There are then error messages that say that cups
   couldn't be stopped as it was not running.
- When a normal reboot is carried out withoutr any update of cups then the startup has
   no delay and it starts without any trouble.
- This patch removes the 300 secs delay from the start_service line in the install.sh paks
   file.
- The PAK_VER is bumped to ensure that this change is shipped

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>