Get it working without `user_allow_other`

[lquenti]

• [x] Check whether the allow_other is actually required
• [x] If not, add a argv entry for the allow_other flag
• [x] Add it to the CLI arguments according to the flag

[lquenti]

See: (https://manpages.debian.org/testing/fuse/mount.fuse.8.en.html#user_allow_other)

[lquenti]

Seems to work with the same user without the flag. Make it variable now