Update unit test coverage threshold

!1155 (merged) changed the test builder from build-angular to custom-webpack. The new test builder finds more files than the old one, resulting in reduced test coverage.

build-angular (old):

custom-webpack (new):

The unittests pipeline job fails because the coverage threshold isn't met anymore. Therefore, it needs to be updated to reflect the current coverage as computed by custom-webpack.

Diff:

p86d9Fdg.diff