Correct missing highlighting of dead code

[dvdoug]

Hello @sebastianbergmann

I've noticed that dead code detection does not seem to be working correctly in the HTML report: the legend indicates that it should be highlighted in yellow but it currently outputs in white.

The HTML itself is correct, just needs a small tweak to the CSS.

Before

After

[codecov]

Codecov Report

Merging #751 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #751   +/-   ##
=========================================
  Coverage     83.87%   83.87%           
  Complexity      846      846           
=========================================
  Files            37       37           
  Lines          2480     2480           
=========================================
  Hits           2080     2080           
  Misses          400      400           

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