main/postmarketos-ui-weston: switch to tinydm

Newbyterequested to merge
Newbyte/pmaports:weston-tinydm into master

Tested and works in QEMU.

I think it makes sense to use TinyDM for Weston as Weston primarily is used for testing purposes and not actual usage, so the lack of prompting for a password is ideal if anything. Besides, I don't think LightDM was configured to prompt for that in this package anyway.

Closes #871 (closed) as all UI:s in the list are converted now.

Edited by Newbyte

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