fix: corrects typo in IFRAME_FEATURE_POLICY

[rediris]

This is a simple fix to the IFRAME_FEATURE_POLICY, wherein a comma was used instead of a semi-colon.

Refer to the following screencap of the console for the warnings:

[openedx-webhooks]

Thanks for the pull request, @rediris!

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[bradenmacdonald]

Thanks @rediris! Looks like we need a CLA from you before we can merge though; would you mind doing that?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.23%. Comparing base (6534347) to head (46271a3).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1500   +/-   ##
=======================================
  Coverage   89.23%   89.23%           
=======================================
  Files         317      317           
  Lines        5557     5557           
  Branches     1375     1376    +1     
=======================================
  Hits         4959     4959           
  Misses        582      582           
  Partials       16       16           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[rediris]

Thanks @rediris! Looks like we need a CLA from you before we can merge though; would you mind doing that?

@bradenmacdonald the individual contribution CLA should be all set. Hopefully the folks at axim can confirm.

[bradenmacdonald]

FYI @feanil @gabor-boros - this is just a typo fix so not changing the intended specs of this security policy, but I want to give you a heads up before merging because it says "Changes to it should be vetted by" the security WG.

[bradenmacdonald]

Thanks for the fix, @rediris !