Eliminate erronoeous duplicate "Unresolved" resolution

It appears that on or shortly before 29 March 2016 a custom "Unresolved" resolution was added beside the built-in default. This might be causing some unresolved issues to be hidden from queries.

I discovered the duplicate resolution when Jira's query auto-completer showed me two Unresolved resolutions, one with double quotes and one without them. When viewing an issue, the two resolutions are indistinguishable as the double quotes are not displayed.

The following Jira searches return disjoint lists of bugs. The first returns ~18,000 issues, while the second returns 135 issues.

project = QTBUG AND resolution = Unresolved ORDER BY resolutiondate ASC
project = QTBUG AND resolution = "\"Unresolved\"" ORDER BY resolutiondate ASC

The custom resolution is still being accidentally set sometimes, most recently on 25 September 2020.

Please (carefully) remove the duplicate resolution after shifting the bugs that currently have it to the built-in version.