bugbot resets the priority field for completely wrong reason

[arai-a]

related to #2829

https://bugzilla.mozilla.org/show_bug.cgi?id=2023633#c3

the timeline is the following:

• the bug was filed in the correct component
• the bug got a priority
• the bugbot closed the bug as invalid, moving the component (bugbot closes a bug that already had a comment from an user with editbug #2829), this is simply wrong
• I undo-ed thhe bugbot's action, reopened the bug, moved the bug back to the correct component
• the bugbot resets the priority field, saying that the component is changed

[suhaibmujahid]

Technically the component was changed, but since it was a false positive in the first place, this just make that mistake more annoying.