Unset auto width for forms when not in subForm to avoid shifts

[CarolineDenis]

Fixes #4738

Checklist

• Self-review the PR after opening it to make sure the changes look good
  and self-explanatory (or properly documented)
• Add relevant issue to release milestone

Testing instructions

• Go to data entry

• Click on taxon

• Input a parent of taxon

• Delete what you selected and reenter a new taxon

• See there is no form shift

• test other places with forms, other data entry forms, app resources, record sets, interactions. Verify width is ok

[bronwyncombs]

Taxon fields are affected in all areas of the software:

This fix works in data entry:

Screen.Recording.2024-04-05.at.11.05.20.AM.mov

But the issue is not fixed in trees dialog:

Screen.Recording.2024-04-05.at.11.07.03.AM.mov

Or embedded dialogs from qcbx (CO in data entry and record set)

Screen.Recording.2024-04-05.at.11.17.50.AM.mov

[emenslin]

Testing instructions

• Go to data entry

• Click on taxon

• Input a parent of taxon

• Delete what you selected and reenter a new taxon

• See there is no form shift

• test other places with forms, other data entry forms, app resources, record sets, interactions. Verify width is ok

In app resources if you try to type in the taxon field there is a form shift

LJ2yj8YSHe.mp4

[maxpatiiuk]

rather than changing this setting, I would propose the following fix:
if treeitem.parent changes, and current treeitem.rank is not a valid rank given the set of ranks allowed for a child of a given treeitem.parent, then unset the treeitem.rank
(i.e when you fetched new ranks in response to 'parent' changing, if current rank is not in the list of possibilities, unset it)

this would fix the API url becoming visible to the user