Handles not included in the committed state error when proving.

[buffrr]

Reproduce:

1. Bind a num that belongs to a subspace, wait for tx to have at least 1 confirmation without falling within the 36 block commit window
2. You will get an error like:

" Cannot prove: data updated at block 7282 is not yet committed. Try again in 26 block(s) "

Fix:
Fallback to fetching more stale data from last committed state instead?