Fix the CSP regression

[Skelmis]

The previous version made a change to the CSP which results in an incorrect CSP policy being set, which leads to it being ignored by browsers.

[dantownsend]

Oops, good catch! Some tests are failing because we need to add the colon to the expected result.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.69%. Comparing base (d4f6e66) to head (1645945).

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #280   +/-   ##
=======================================
  Coverage   92.69%   92.69%           
=======================================
  Files          34       34           
  Lines        2053     2053           
=======================================
  Hits         1903     1903           
  Misses        150      150           

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