This is a small cleanup (suggested by @colemanw) that makes the `karma.conf.js` appear more general.

It modifies the startup process for a test-runner; as long as the test-runner still gives the
same output, it should be safe.

Before
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`karma` loads baseline Angular modules and CiviCase Angular modules.

After
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`karma` loads baseline Angular modules and any/all component-based Angular modules

Comment
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Why was it only CiviCase?  Not certain...  but I *think* it's because
(historically) `crmMailing.ang.php` did extra work to build `settings`, and
this extra work was a bit too heavy.  That work has moved (`settings` became
`settingsFactory`) and maybe makes this safer.