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Tracks: Set the grid colour based on others

COL_GRID used to be mid-way between the usual COL_BACKGROUND and
COL_TRACK_BACKGROUND.  But then I changed mkhighlight() so that it
didn't make COL_BACKGROUND so dark and that made the grid lines
indistinguishable from the track background.

Now COL_GRID is generated from COL_BACKGROUND and COL_TRACK_BACKGROUND
so as long as those are sufficiently distinct from each other, COL_GRID
will be distinct from both of them.

--- a/tracks.c

+++ b/tracks.c

@@ -2515,12 +2515,13 @@

     int i;

     game_mkhighlight(fe, ret, COL_BACKGROUND, -1, COL_TRACK_BACKGROUND);

+    colour_mix(&ret[COL_BACKGROUND*3], &ret[COL_TRACK_BACKGROUND*3], 0.5F,

+               &ret[COL_GRID*3]);

     for (i = 0; i < 3; i++) {

         ret[COL_TRACK_CLUE       * 3 + i] = 0.0F;

         ret[COL_TRACK            * 3 + i] = 0.5F;

         ret[COL_CLUE             * 3 + i] = 0.0F;

-        ret[COL_GRID             * 3 + i] = 0.75F;

         ret[COL_CURSOR           * 3 + i] = 0.3F;

         ret[COL_ERROR_BACKGROUND * 3 + i] = 1.0F;

     }