Add value property to team selection options in Settings page

[cstns]

Description

The listbox component requres that option have a value key in order to function. The teams options were missing that key.

Related Issue(s)

closes #6523

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production
• Link to Changelog Entry PR, or note why one is not needed.
  • no need

Labels

• Includes a DB migration? -> add the area:migration label

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.45%. Comparing base (6b2a871) to head (328c09f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6534   +/-   ##
=======================================
  Coverage   76.45%   76.45%           
=======================================
  Files         397      397           
  Lines       20011    20011           
  Branches     4812     4812           
=======================================
  Hits        15300    15300           
  Misses       4711     4711           

Flag	Coverage Δ
backend	76.45% <ø> (ø)

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