Disable jsonp usage to make BR work with CSP

[cdrini]

No description provided.

[bfalling]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 69.28%. Comparing base (ce47c72) to head (9ba0f7c).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/plugins/plugin.chapters.js	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1358   +/-   ##
=======================================
  Coverage   69.28%   69.28%           
=======================================
  Files          59       59           
  Lines        5088     5088           
  Branches     1072     1072           
=======================================
  Hits         3525     3525           
  Misses       1536     1536           
  Partials       27       27           

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[cdrini]

Tested:

• chapters work
• Search works
• TTS works