Show review form for style managers

[Xpirix]

Currently, only staff users can review (approve or reject) a style.

Changes summary

This PR is a fix to show the style review form for staff users and users in the Group Style Managers.

Requirements

In the administration panel, the permissions for that Group should be updated (Chosen permissions are empty):

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (a062b30) 36.08% compared to head (b075095) 36.06%.

Files	Patch %	Lines
qgis-app/base/views/processing_view.py	0.00%	1 Missing ⚠️
qgis-app/styles/tests/test_views.py	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #355      +/-   ##
==========================================
- Coverage   36.08%   36.06%   -0.02%     
==========================================
  Files         111      111              
  Lines        4897     4899       +2     
==========================================
  Hits         1767     1767              
- Misses       3130     3132       +2     

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