Remove text-shadow from Diffusion blame column commit IDs
Summary:
Same game as D26151 or D26153: `.phabricator-source-blame-info a` has a variable text `color` but a hardcoded `text-shadow` color.
The shadow will look pretty bad once the background color is also properly supported in dark mode, so remove it.
Refs T15056
Test Plan:
* Go to http://phorge.localhost/settings/panel/display/ and set Accessibility to Dark Mode (Experimental)
* Go to http://phorge.localhost/source/somerepo/browse/somebranch/somefile.foo in Diffusion
* Look veeeery closely at the 12 character commit IDs in the blame column; ideally manually change the background color as we have not adjusted that part yet for Dark Mode.
Reviewers: O1 Blessed Committers, amybones, mainframe98
Reviewed By: O1 Blessed Committers, amybones, mainframe98
Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Maniphest Tasks: T15056
Differential Revision: https://we.phorge.it/D26187