feat: remove offset when studio header exists

[khudym]

Description

• this PR proposes making the TinyMce toolbar_sticky_offset to 0 when there is "studio-header" on the page

Before

Schedule & details page

Course updates page

After

Schedule & details page

Course updates page

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.92%. Comparing base (c84e322) to head (ccbe859).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #491      +/-   ##
==========================================
+ Coverage   88.86%   88.92%   +0.05%     
==========================================
  Files         248      248              
  Lines        4534     4540       +6     
  Branches      933      940       +7     
==========================================
+ Hits         4029     4037       +8     
+ Misses        474      470       -4     
- Partials       31       33       +2     

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