Fix selected brandstore not persisting

[codeEmpress1]

Done

• Fix selected brand store not persisting if an error occur when trying to register snap name

How to QA

• Go to https://snapcraft-io-4506.demos.haus/register-snap
• Select a brand store
• Fill in snapd or any registered snap name into the snap name field
• click on register, an error will be displayed
• Ensure that the store displayed in the store field is the same store you selected earlier

Issue / Card https://warthogs.atlassian.net/browse/WD-8313

Fixes # #4392

Screenshots

[webteam-app]

Demo starting at https://snapcraft-io-4506.demos.haus

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (901647f) 79.83% compared to head (e076005) 79.83%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4506      +/-   ##
==========================================
- Coverage   79.83%   79.83%   -0.01%     
==========================================
  Files         207      206       -1     
  Lines       10505    10501       -4     
  Branches      926      926              
==========================================
- Hits         8387     8383       -4     
  Misses       1994     1994              
  Partials      124      124              

Flag	Coverage Δ
javascript	68.43% <ø> (ø)
python	85.73% <ø> (-0.01%)	⬇️

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[steverydz]

LGTM 👍