CRM_Utils_StringTest - Fix false-negative on systems with non-standard HTTP port

CRM_Utils_StringTest - Fix false-negative on systems with non-standard HTTP port

Before
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On a local build with the base URL `http://dmaster.bknix:8001`, the test
`testSimplifyURL()` fails because the actual URL includes `:8001`.  The
actual URL is correct, but the test expectation is wrong.

After
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The test passes.

Comments
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* In the continuous-integration server, we've traditionally tested with
  the default/blank port (`http://core-1234-1234.test-ubu1204-5.civicrm.org`), so
  this didn't come up.
* The formatt returned by `simpleParseUrl()`  in `host+port` is clever about colons.
  It has unit-test coverage to show this.