Update core/tabs/system-setup/fedora/fedora-upgrade.sh

Co-authored-by: Adam Perkowski <adas1per@protonmail.com>

Author: Angaddeep Singh

core/tabs/system-setup/fedora/fedora-upgrade.sh

@@ -4,7 +4,6 @@
 
 current_version=$(rpm -E '%{fedora}')
 next_version=$((current_version + 1))
-previous_version=$((current_version - 1))
 
 update() {
     printf "%b\n" "${RED}Make sure your system is fully updated; if not, update it first and reboot once.${RC}"