fix fedora timeshift

[nnyyxxxx]

@ChrisTitusTech this does not make timeshift fedora only, this only makes it so timeshift cannot be seen by fedora users, please look at #773 for more information

closes #773

Type of Change

• [x] Bug fix

Description

since fedora does not support the use of timeshift, it should be excluded.

more information is in this issue #773

testing

Tested using a fedora container and my main system (Arch Linux), and the precondition works flawlessly