[frontend] change icon for PolarArea

[lndrtrbn]

Proposed changes

• Change icon for PolarArea when choosing a widget in dashbaord

Related issues

• Icon for polar area widget is the same as radar #6523

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.69%. Comparing base (5993973) to head (921f4e4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6531   +/-   ##
=======================================
  Coverage   67.69%   67.69%           
=======================================
  Files         532      532           
  Lines       65010    65010           
  Branches     5445     5446    +1     
=======================================
+ Hits        44009    44010    +1     
+ Misses      21001    21000    -1     

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