There were two problems here:
1. On the JS side, the reference to $widgetBody didn't refer to the
right DOM element any more. This might be because it was replaced by
the `getMergeStatus` method. Even if it wasn't, ensuring we have the
right element means that the content gets updated.
2. On the Ruby side, the `log_merge_error` method didn't update the
`merge_error` column of the merge request. Change that to update if
requested, and update in the most common cases by default.
Additionally, this would sometimes return an error hash, but it
doesn't look like this was ever used (the return value of
`MergeService#execute` appears to be unused everywhere).
