Revert word array length change

It turns out that the rfc sets a limit of 15 arguments and the
server (irccloud) sending that many in ISUPPORT was updated to
split it into multiple lines.

src/common/hexchat.h

@@ -75,7 +75,7 @@
 #define DOMAINLEN	100
 #define NICKLEN		64				/* including the NULL, so 63 really */
 #define CHANLEN		300
-#define PDIWORDS	48
+#define PDIWORDS	32
 #define USERNAMELEN 10
 #define HIDDEN_CHAR	8			/* invisible character for xtext */