Daily cron job script unnecessarily executes `find` with `rm` instead of using its '-delete' action

[Akbarkhon Variskhanov]

Executing `rm` as a separate process each time for every single file is unnecessary and inefficient. The option '-delete' should be used instead.

Patch is included below.

[Ubuntu Foundations Team Bug Bot (crichton)]

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[Akbarkhon Variskhanov (kbar)]

Also removed -prune primary as it conflicted with -depth, which is automatically turned on by -delete.

[Akbarkhon Variskhanov (kbar)]

Replaced -prune with -maxdepth 1 because -delete automatically turns on -depth.

Reverted the second command back to its original state as -delete can't delete directories that aren't empty.