sysutils/appjail: Update to 3.1.0

ChangeLog: https://github.com/DtxdF/AppJail/releases/tag/v3.1.0

 * Added: {nullfs|<pseudofs>}:reverse feature.
 * Improved: AppJail image:
        Add Imagetype.
        Improve Slogan.
 * Improved: creation of a bridge (A lock file is used to ensure that the bridge
   is not attempted to be created by two or more processes at the same time.).
 * Fixed: bottleneck in repeat (sleep(1) command is now started after a command
   failure instead of executing on the first try. This ensures that the command
   exits as quickly as possible instead of waiting for the sleep(1) time and the
   command time.).

PR:		276355
Reported by:	DtxdF@disroot.org (maintainer)