fix device groups layout

[Steve-Mcl]

closes #4712

Description

• fix tab highlight being lost
• fix layout by utilising the SectionTopMenu like other pages in the app do

Related Issue(s)

#4712

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

Labels

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

[cstns]

Looking good!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.73%. Comparing base (eee84bc) to head (2d74e7a).
Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4817   +/-   ##
=======================================
  Coverage   78.73%   78.73%           
=======================================
  Files         314      314           
  Lines       15063    15063           
  Branches     3461     3461           
=======================================
  Hits        11860    11860           
  Misses       3203     3203           

Flag	Coverage Δ
backend	78.73% <ø> (ø)

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