fix display of default data model binding

[lassopicasso]

Description

Fix display of default selected data model when featureFlag is not enabled. Related to, #12738
Atm it doesn't display the name of the default data model binding.

Before:

After:

Related Issue(s)

• itself

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)

Documentation

• User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (ede94f7) to head (f911f1d).
Report is 12 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #13185      +/-   ##
===========================================
+ Coverage   92.75%   100.00%   +7.24%     
===========================================
  Files        1447         2    -1445     
  Lines       20289        50   -20239     
  Branches     2435        15    -2420     
===========================================
- Hits        18820        50   -18770     
+ Misses       1203         0    -1203     
+ Partials      266         0     -266     

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