Loosen PluginComponents PropType requirement for WindowTopBarPluginMenu

[marlo-longley]

This removes an error scary warning found in testing plugin integration in M4 (specifically as part of sul-dlss/sul-embed#2333)

This aligns this PropType with other components: for example see

mirador/src/components/BackgroundPluginArea.js

Line 13 in 6e15d9f

PluginComponents: PropTypes.array, // eslint-disable-line react/forbid-prop-types

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.05%. Comparing base (6e15d9f) to head (b402e2f).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4096      +/-   ##
==========================================
- Coverage   95.05%   95.05%   -0.01%     
==========================================
  Files         315      315              
  Lines       15906    15904       -2     
  Branches     2494     2494              
==========================================
- Hits        15120    15117       -3     
- Misses        782      783       +1     
  Partials        4        4              

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