Showing indeterminate progress indicator breaks signup submittions in Chrome

[DougReeder]

    This change seems to break signup for me. When trying to submit the form, the progress indicator shows up, but the POST request is not sent. Commenting out the click handler fixes the problem: https://github.com/remotestorage/armadietto/blob/ae4f16c861196d84afa1f9051cd4e48c58a9cb9c/lib/assets/armadietto-utilities.js#L36-L46

Anybody else seeing this? I'm a bit puzzled as to why it's not working. I don't see a preventDefault() call that would stop the actual submit event.

Originally posted by @galfert in #97 (comment)