remove proton vpn repo deb after installation

install_functions.sh

@@ -344,6 +344,7 @@ install_protonvpn() {
     repo_installer_file="$downloads_path/proton_repo.deb"
     wget https://repo.protonvpn.com/debian/dists/stable/main/binary-all/protonvpn-stable-release_${proton_repo_version}_all.deb -O $repo_installer_file
     sudo dpkg -i $repo_installer_file
+    rm $repo_installer_file
 
     $apt_update_cmd
     $apt_install_cmd proton-vpn-gnome-desktop