Fix #51: Fixed Issues are always set to Resolved status

Prior to this, whe plugin would always set a fixed issue's status to
Resolved, regardless of how the the "Resolve Fixed Issues" option
(plugin_Source_enable_resolving) is set in the config page.
oops

I was a bit too trigger-happy with the search/replace in commit
250c07917cb74afdfe29b5e73b18b753e7315ee1