Add equal spaces for top & bottom for Blazor toolbar

[enisn]

Description

Closes https://github.com/volosoft/volo/issues/14302

Now buttons have equal spaces from top & bottom:

Checklist

• I fully tested it as developer / designer and created unit / integration tests
• I documented it (or no need to document or I will create a separate documentation issue)

How to test it?

Please describe how this can be tested by the test engineers if it is not already explicit - or remove this section if no need to description.

[codecov]

Codecov Report

Merging #17347 (da90157) into rel-7.3 (55d2859) will not change coverage.
Report is 5 commits behind head on rel-7.3.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           rel-7.3   #17347   +/-   ##
========================================
  Coverage    53.34%   53.34%           
========================================
  Files         2982     2982           
  Lines        92350    92350           
========================================
  Hits         49263    49263           
  Misses       43087    43087           

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