remove unused option in app-image creation [skip ci]

references 84732337cacc87211d05cdc1c04e88855e373077

.github/workflows/appimage.yml

@@ -116,7 +116,6 @@ jobs:
           --java-options "-Dcryptomator.showTrayIcon=true"
           --java-options "-Dcryptomator.integrationsLinux.trayIconsDir=\"@{appdir}/usr/share/icons/hicolor/symbolic/apps\""
           --java-options "-Dcryptomator.buildNumber=\"appimage-${{  needs.get-version.outputs.revNum }}\""
-          --add-launcher Cryptomator-gtk2=launcher-gtk2.properties
           --resource-dir dist/linux/resources
       - name: Patch Cryptomator.AppDir
         run: |