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magnets: Area constraints; fix message.

(The restriction on 2x2 puzzles is because the board layer-out doesn't
use neutral pieces on such small boards, and the only soluble 2x2 boards
have neutral pieces.  I haven't investigated the Tricky size limit, but
it seems entirely reasonable that all the smaller boards are too easy.
--bjh21)

(cherry picked from Android port, commit
133794977a13767e0c1596be6a5b26f2cf2d1fd1)

--- a/magnets.c

+++ b/magnets.c

@@ -230,8 +230,15 @@

 static const char *validate_params(const game_params *params, bool full)

 {

-    if (params->w < 2) return "Width must be at least one";

-    if (params->h < 2) return "Height must be at least one";

+    if (params->w < 2) return "Width must be at least two";

+    if (params->h < 2) return "Height must be at least two";

+    if (params->diff >= DIFF_TRICKY) {

+        if (params->w < 5 && params->h < 5)

+            return "Either width or height must be at least five for Tricky";

+    } else {

+        if (params->w < 3 && params->h < 3)

+            return "Either width or height must be at least three";

+    }

     if (params->diff < 0 || params->diff >= DIFFCOUNT)

         return "Unknown difficulty level";