fix: don't shrink window when setting minimum width

[kwvg]

Additional Information

• Closes (Minor UI bug - Windows 10) Window width resizes after closing Settings>Options modal via "Close"/"OK"/"X" buttons #5886
• We've been setting restrictions on the width of the window since dash#3734 (see d351fca and c0447b0), meaning, the behavior as described in dash#5886 has been present since v0.16 (v0.15 and earlier used the old UI design).
  • We do not set any restrictions on height and in that respect, Dash Qt will behave similar to Bitcoin Qt in that it can be resized to be arbitrarily small.

How Has This Been Tested?

Crossed compiled for x86_64-w64-mingw32 and tested resulting dash-qt.exe on Windows 11 22H2 (Build 22621.431). Followed reproduction steps as mentioned in dash#5886, found width to persist even after closing Options modal using buttons and the close button on the top right.

Breaking Changes

None expected.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests (note: N/A)
• I have made corresponding changes to the documentation (note: N/A)
• I have assigned this pull request to a milestone (for repository code-owners and collaborators only)

[PastaPastaPasta]

generally utACK e080686

Can you describe how you tested this?

[kwvg]

Updated PR description to include testing method

[knst]

LGTM e080686

seems as only two mis-usage and both are covered

[UdjinM6]

utACK e080686