tests: Remove verbose logging settings from DevelopmentSettings.php

tests: Remove verbose logging settings from DevelopmentSettings.php

Follows-up fdb7d36903. It seems these make unit tests on Travis CI
fail, per T187581. And when we briefly enabled DevelopmentSettings.php
in our Jenkins setup, the PHPUnit tests also failed.

Remove these from DevelopmentSettings.php to confirm that the
tests pass that way. Then, once our own Jenkins setup has switched
back to using DevelopmentSettings.php, we can re-consider adding
these in a way that is verified by Gerrit/Jenkins before merging.

Bug: T187581
Change-Id: Ib81c5909849598bdad02955f6414d68c038742c5