Better color for non relative commit text

When option "Draw non relatives text gray" is selected, the text of commit in the revision grid is too light and not readable.
This commit fix that and also the fact that with the new darker gray, when the line is selected, the text is not readable too.
Non relative commit text could be in gray even if revison graph is not

We could now have the text of a non relative commit in gray even if the graph of non relatives branches is not in gray.
The 2 options are ne more link (why was the case before?)
Merge branch 'pr/n1611_pmiossec' into release/2.44

Non relative commit text could be in gray even if revison graph is not