fix(flatpak): fix broken desktop file, icons, and service#3561

ReenigneArcher merged 1 commit intomasterLizardByte/Sunshine:masterfrom

fix/packaing/do-not-use-svg-for-linux-desktop-fileLizardByte/Sunshine:fix/packaing/do-not-use-svg-for-linux-desktop-fileCopy head branch name to clipboard