fix appimage CI build

.github/workflows/appimage.yml

@@ -93,7 +93,7 @@ jobs:
           --java-options "-Dcryptomator.ipcSocketPath=\"@{userhome}/.config/Cryptomator/ipc.socket\""
           --java-options "-Dcryptomator.mountPointsDir=\"@{userhome}/.local/share/Cryptomator/mnt\""
           --java-options "-Dcryptomator.showTrayIcon=false"
-          --java-options "-Dcryptomator.integrationsLinux.trayIconsDir=\"${TRAYICONSDIR}\"" \
+          --java-options "-Dcryptomator.integrationsLinux.trayIconsDir=\"${TRAYICONSDIR}\""
           --java-options "-Dcryptomator.buildNumber=\"appimage-${{  needs.get-version.outputs.revNum }}\""
           --add-launcher Cryptomator-gtk2=launcher-gtk2.properties
           --resource-dir dist/linux/resources