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tracks: Make the keyboard cursor more visible

The former grey was almost indistinguishable from its background colours
even on a good screen.  I've separated the cursor colour from the grid
colour and made it a lot darker. This gives a contrast ratio over 3.0
even against a darkened tile.

The cursor is still hard to see against trackwork, so maybe something
that isn't grey would be even better.

--- a/tracks.c

+++ b/tracks.c

@@ -2443,7 +2443,7 @@

         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] = 0.6F;

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

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

     }

@@ -2665,7 +2665,7 @@

             curx = ox + TILE_SIZE - off; curw = 2*off + 1;

         }

-        draw_rect_outline(dr, curx, cury, curw, curh, COL_GRID);

+        draw_rect_outline(dr, curx, cury, curw, curh, COL_CURSOR);

     }

     /* Draw tracks themselves */