engine: increase MAX_INIT_MSG to 192 kilobytes limit

* also avoid magic number in sv_client.c

engine/common/net_ws.h

@@ -31,7 +31,7 @@ typedef enum
 
 
 #if !XASH_LOW_MEMORY
-#define MAX_INIT_MSG		0x20000	// max length of possible message
+#define MAX_INIT_MSG		0x30000	// max length of possible message
 #else
 #define MAX_INIT_MSG		0x8000
 #endif

engine/server/sv_client.c

@@ -1316,7 +1316,7 @@ a deathmatch.
 */
 void SV_PutClientInServer( sv_client_t *cl )
 {
-	static byte    	msg_buf[0x20200];	// MAX_INIT_MSG + some space
+	static byte    	msg_buf[MAX_INIT_MSG + 0x200];	// MAX_INIT_MSG + some space
 	edict_t		*ent = cl->edict;
 	sizebuf_t		msg;