fix: NaN in new policy rule ID

[ErlingHauan]

Description

Fixes NaN in rule ID when creating a new policy rule, when the previous rule was a string.

Related Issue(s)

• Settings issues #13164

Before

1.mov

After

settings-issue-after.mp4

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.21%. Comparing base (ed8886d) to head (37a105f).
Report is 14 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13598   +/-   ##
=======================================
  Coverage   95.21%   95.21%           
=======================================
  Files        1497     1497           
  Lines       20455    20462    +7     
  Branches     2473     2474    +1     
=======================================
+ Hits        19476    19483    +7     
  Misses        872      872           
  Partials      107      107           

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[Jondyr]

Solid👍
Accounts for potential reordering of the list in the future👏

[mlqn]

Tested OK in dev ✅