Typo in sentry config filename

[Centzilius]

Hi, I just noticed that there is a file called setnry.properties that has been added with the initial commit of this repository.

https://github.com/pretix/pretixscan-android/blob/master/pretixscan/setnry.properties

https://github.com/pretix/pretixscan-android/blob/master/BUILDING.md seems to suggest that local.properties is to be used so it might be fine to just delete that file?