Removing some copy pasted code Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2970>
Some rain-mode properties tried to read float from int value. Initialize rain after setting rain-mode. Rain was non-functional if width/height were left at default values. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1459>