Fix #2197: Fix color of links on about page in night mode

[domdomegg]

This is a copy of #2199 as it accidentally got undone in #2290

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Description

Fixes #2197

Tests performed

Tested 2.9.0-debug-master~b1056572 on Galaxy Nexus (emulator) with API level 28.

Checked did not break non-night mode version:

Screenshots showing what changed

Before	After

[codecov-io]

Codecov Report

Merging #2604 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #2604   +/-   ##
======================================
  Coverage    2.69%   2.69%           
======================================
  Files         258     258           
  Lines       12312   12312           
  Branches     1114    1114           
======================================
  Hits          332     332           
  Misses      11954   11954           
  Partials       26      26

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