Remove feedbackd theme from mobian-<device>-tweaks?
It would be nice if we can remove device specific feedbackd theme from mobian-\<device\>-tweaks.
In feedbackd, there is an mechanism to load device specific theme by checking devicetree and find an appropriate file from `XDG_DATA_DIRS`.
If we package something like https://source.puri.sm/Librem5/feedbackd-device-themes , we don't need to set FEEDBACK_THEME .
Note that, this does not work with current version of feedbackd in mobian due to a bug. However this is already fixed in upstream [1].
### Additional Information
[1] https://source.puri.sm/Librem5/feedbackd/-/commit/1c53464090946efb7bd18c80d4ea52bd77d0538c
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