Fix Pokéstop spinning.

[sebastienvercammen]

The API can return 0 as max_item_storage, mostly seen when accounts haven't completed the tutorial yet. This overwrites the original default of 350 and makes the pokéstop spinning check on worker.py#L823 fail every time.

No pokéstop spinning = accounts stay at level one = captchas.

[peterchabs]

where do i know you from?

[bbdoc]

confirmed working. Just initialized a bunch of new accounts where I usually would have received quite some captchas. All accounts leveled up correctly and I didn't get a single captcha ! Thanks

[ZeChrales]

ok confirmed with mitm