Fix various edge cases in extensible synchronisation.

- Fix not forwarding the accountid extensible if it is set.
- Rename the variadic Set() overload to SetFwd().
- Re-add the `const T&` overload of Set().
- Move `bool synced` to SimpleExtItem from StringExtItem.
- Only sync extensibles if their instance is marked as syncable.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/modules/m_joinflood.cpp b/src/modules/m_joinflood.cpp
index ae29811e3..2fff26377 100644
--- a/src/modules/m_joinflood.cpp
+++ b/src/modules/m_joinflood.cpp
@@ -123,7 +123,7 @@ class JoinFlood final
 			return MODEACTION_DENY;
 		}
 
-		ext.Set(channel, nsecs, njoins);
+		ext.SetFwd(channel, nsecs, njoins);
 		return MODEACTION_ALLOW;
 	}