Clean up c_permit values of deity commands

A player may execute a command when his player->nstat has all the bits
in the command's c_permit.

Normal player commands require bit(2).  Command break requires bit(1),
and execute requires bit(5).  Deity commands require both bit(2) and
bit(3).  Works, because deities always have both bits set in nstat, as
they may execute normal player commands, too.  But it's a bit
confusing.  Change them to only require their own bit(3).

include/com.h

@@ -38,7 +38,7 @@ struct cmndstr {
     int c_cost;			/* btu cost of command */
     int (*c_addr)(void);	/* core addr of appropriate routine */
     int c_flags;		/* command flags */
-    int c_permit;		/* who is allowed to "do" this command */
+    int c_permit;		/* command capabilities required */
 };
 
 /* Command flag bits */