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Bound edge thicknesses below so that they're always thicker than the
grid lines.

[originally from svn r7349]

--- a/filling.c

+++ b/filling.c

@@ -907,7 +907,7 @@

 #define PREFERRED_TILE_SIZE 32

 #define TILE_SIZE (ds->tilesize)

 #define BORDER (TILE_SIZE / 2)

-#define BORDER_WIDTH (TILE_SIZE / 32)

+#define BORDER_WIDTH (max(TILE_SIZE / 32, 1))

 struct game_drawstate {

     struct game_params params;

--- a/galaxies.c

+++ b/galaxies.c

@@ -2075,7 +2075,7 @@

 #define PREFERRED_TILE_SIZE 32

 #define TILE_SIZE (ds->tilesize)

 #define DOT_SIZE        (TILE_SIZE / 4)

-#define EDGE_THICKNESS (TILE_SIZE / 16)

+#define EDGE_THICKNESS (max(TILE_SIZE / 16, 2))

 #define BORDER TILE_SIZE

 #define COORD(x) ( (x) * TILE_SIZE + BORDER )