[Fix] catch JSX fragments with propElementValues

[mfigard]

Bug report: #3951

This proposed fix treats JSX fragments like JSX elements when handling the propElementValues option:

• It checks for unnecessary curly brackets in JSX fragments just like it does in JSX elements
• It considers JSX fragment when checking and reporting missing curly brackets

Let me know what you think, happy to update the code with any suggestions you have!

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.78%. Comparing base (f2869fd) to head (94e2467).

Files with missing lines	Patch %	Lines
lib/rules/jsx-curly-brace-presence.js	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3952      +/-   ##
==========================================
- Coverage   97.84%   97.78%   -0.06%     
==========================================
  Files         136      133       -3     
  Lines       10008     9999       -9     
  Branches     3717     3718       +1     
==========================================
- Hits         9792     9778      -14     
- Misses        216      221       +5     

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