Fix #442, xact priority sorted incorrectly

[dmknutsen]

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Describe the contribution
Pulled in fix from @ctolbert555
Marked as draft because I still need to test the update against the open source

Fixed priority sort functionality

Previously, if the priority to be inserted was the lowest number (highest prio) it would have no matches and be inserted into the back of the queue, which is incorrect, as the sort is meant to sort from lowest number to highest. Now, if it is the lowest number it will be inserted into the front of the queue.
Fixes #442

Testing performed
TBD

Expected behavior changes
TBD

System(s) tested on
TBD

Contributor Info - All information REQUIRED for consideration of pull request
Dan Knutsen
NASA Goddard