Reduced min table width

The initial table width is too high. The table starts to scale down far
too soon, meaning you have to play in a letterbox ratio.

cockatrice/src/tablezone.h

@@ -24,7 +24,7 @@ private:
     static const int PADDING_X  = 35;
     static const int PADDING_Y = 10;
     static const int MARGIN_X = 20;
-    static const int MIN_WIDTH = 15 * CARD_WIDTH / 2;
+    static const int MIN_WIDTH = 10 * CARD_WIDTH / 2;
     
     /*
     Default background color, inactive mask and boarder gradient