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cube.c: Prohibit unsolvable single row/column game

For cube games, the minimum for any dimension should be 2, as there is
no net of the cube that is only one row/column. The previous logic
would permit a 1x7 game (for example) that could never be solved.

--- a/cube.c

+++ b/cube.c

@@ -543,8 +543,8 @@

 	return "Unrecognised solid type";

     if (solids[params->solid]->order == 4) {

-	if (params->d1 <= 0 || params->d2 <= 0)

-	    return "Both grid dimensions must be greater than zero";

+	if (params->d1 <= 1 || params->d2 <= 1)

+	    return "Both grid dimensions must be greater than one";

     } else {

 	if (params->d1 <= 0 && params->d2 <= 0)

 	    return "At least one grid dimension must be greater than zero";