fix #2081

Increase default/recommended mask list size limit to 150;
SAMODE overrides enforcement of the limit.

default.yaml

     whowas-entries: 100
 
     # maximum length of channel lists (beI modes)
-    chan-list-modes: 60
+    chan-list-modes: 150
 
     # maximum number of messages to accept during registration (prevents
     # DoS / resource exhaustion attacks):

irc/modes.go

 			mask := change.Arg
 			switch change.Op {
 			case modes.Add:
-				if channel.lists[change.Mode].Length() >= client.server.Config().Limits.ChanListModes {
+				if !isSamode && channel.lists[change.Mode].Length() >= client.server.Config().Limits.ChanListModes {
 					if !listFullWarned[change.Mode] {
 						rb.Add(nil, client.server.name, ERR_BANLISTFULL, details.nick, chname, change.Mode.String(), client.t("Channel list is full"))
 						listFullWarned[change.Mode] = true

traditional.yaml

     whowas-entries: 100
 
     # maximum length of channel lists (beI modes)
-    chan-list-modes: 60
+    chan-list-modes: 150
 
     # maximum number of messages to accept during registration (prevents
     # DoS / resource exhaustion attacks):