android: stricten mimetypes app accepts from */* to application/octet-stream

[aveao]

Apparently some users have an issue with the app being incorrectly used for opening certain types, like PDFs.

https://discord.com/channels/221364737269694464/221364737269694464/1507412822324412446

This strictens the accepted content types. We could drop this line fully and rely on the filter lines above for pbw, pbz, pbl, but it might break opens from situations where real filename aren't reported.

[sjp4]

When I tested this out it didn't work (pebble did not appear when i clicked on a pbw/pbz from the file manager app).

I'm not aware of any way around this other than making the choice that we don't support loading those files types from provider-based sources (we have made the decision to make it work from all sources, at the cost of being annoying to the user)

[aveao]

It works for me with pbws at least, with the (google pixel) files app, I'll test pbz shortly.

[aveao]

Both still work for me (but successfully, it was offered for PDFs before but not anymore). Have you tested with no */* at all, or also with application/octet-stream?

[sjp4]

I'm not in front of it right now but was likely testing with the samsung files app on my primary dev phone - I'll try to test that again

[aveao]

Thanks