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lightup: Ban 2x2 with either 4-way type

(2x2 with four-way symmetry must be either all-black (trivial) or
all-white (ambiguous). --bjh21)

(cherry picked from Android port, commit
27ae898e118b0a31a98d393bf56aa138845123e6)

--- a/lightup.c

+++ b/lightup.c

@@ -353,6 +353,8 @@

             if (params->symm == SYMM_ROT4)

                 return "4-fold symmetry is only available with square grids";

         }

+        if ((params->symm == SYMM_ROT4 || params->symm == SYMM_REF4) && params->w < 3 && params->h < 3)

+            return _("Width or height must be at least 3 for 4-way symmetry");

         if (params->symm < 0 || params->symm >= SYMM_MAX)

             return "Unknown symmetry type";

         if (params->difficulty < 0 || params->difficulty > DIFFCOUNT)