22.04 - GPD Pocket 3 - display device is named DSI-1 not DSI1

[ShaneMcC]

On 22.04 on the GPD Pocket 3 - the display device is sometimes named DSI-1 not DSI1

https://github.com/wimpysworld/umpc-ubuntu/blob/master/data/umpc-display-rotate.c#L52

refers to the old name.

Looks like a similar change was needed for the scaler script:

https://github.com/wimpysworld/umpc-ubuntu/commit/626bc11ba27c93bfd28b218c179c4cb1df97a85b