Changing the wallpaper option to "Static" will not stop the Random Wallpaper option

Version: wallpaper-antix 0.6.0

Description: When the Random Wallpaper Timer option is selected, it cannot be disabled from the antiX Wallpaper app.

Steps to reproduce:

0. Launch "wallpaper" app. Select and apply the option "Random Wallpaper Timer".
1. Select and apply "Static" option. The wallpaper changes to the selected static image.
2. Close the antiX Wallpaper program.

Symptoms: The wallpaper icon remains on the systray. The wallpaper keeps changing randomly, even if Static was applied.

1. Restarting the session didn't disable the random wallpaper timer.
2. Log-out and then log-in removed the systemtray icon but the timer was still on (and the wallpaper changed).
3. Rebooting was the only way to apply the Static option permanently (and disable the Random Wallpaper Timer).

Extra: If the Random Wallpaper Timer is already on, Applying that option again creates a new random-timer icon.

Speculation: The script does not check if there is a wallpaper Random Timer already running, and so it doesn't remove it (if needed).