idbfs backend: If `reconcile()` triggers QuotaExceededError, callback is never called

[past-due]

In library_idbfs.js's reconcile() function, the transaction may abort if (for example) a QuotaExceededError occurs.

However, since no abort/onabort handler is currently added, the callback will never be called in this case.

Expected behavior:

The callback passed-in to reconcile() is called with the error, even if the transaction aborts.

Version of emscripten/emsdk:
3.1.53