Same Game: more efficient tile_redraw

I've rewritten tile_redraw to reduce the number of calls to
draw_rect().  Before, it would generally make five calls to
draw_rect() when drawing a tile.  Now it makes at most three, and
usually two.  That's one draw_rect() for each colour that appears in
the tile, which is as good as it can get.  This reduces the time to
draw a large puzzle by about 35% on Firefox 102.

This is of significance to me because CanvasRenderingContext2D on my
test KaiOS device seems to have a limit on the number of fill() and
fillRect() calls that it will tolerate in a short time.  This means
that if you issue more than 1024 fillRect() calls in rapid succession,
the later ones are simply ignored.

Same Game's largest preset called draw_rect() so much that it hit this
limit.  That meant that the right-hand side of the grid didn't get
properly drawn when starting a new game.  Now that it is less
profligate with draw_rect() it fits comfortably within the limit and I
get to see the entire grid.

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