Change default flood rates to match RFC1459, prevent excess flood problems

I noticed that the default network flood rates are wrong (for most
networks). It has been very standard since the beginning of IRC to use a
value of 2 seconds per line, with a 10 line head start. Almost all
networks work this way, and if you don't follow, having a lot of
channels or a lot of clients connected to ZNC results in excess flood
disconnections and much frustration for the user.

I think you should make the default value for these 2 and 9 instead of 1
and 4 so that this nasty bug doesn't hit people who will not know how to
debug it. You find these same types of settings built into every IRC
client. 2 and 10 is the standard. 2 and 9 provides a slight buffer so
there is no mistake.

Thanks
-Rubin

Close #1416

modules/webadmin.cpp

@@ -1000,8 +1000,8 @@ class CWebAdminMod : public CModule {
                 Tmpl["TrustAllCerts"] = "false";
                 Tmpl["TrustPKI"] = "true";
                 Tmpl["FloodProtection"] = "true";
-                Tmpl["FloodRate"] = "1.0";
-                Tmpl["FloodBurst"] = "4";
+                Tmpl["FloodRate"] = "2.0";
+                Tmpl["FloodBurst"] = "9";
                 Tmpl["JoinDelay"] = "0";
                 breadNet["Text"] = t_s("Add Network");
             }