Fix channel search when custom scrollback limit is used (#4496)

src/common/Channel.cpp

@@ -28,6 +28,7 @@ Channel::Channel(const QString &name, Type type)
     : completionModel(*this)
     , lastDate_(QDate::currentDate())
     , name_(name)
+    , messages_(getSettings()->scrollbackSplitLimit)
     , type_(type)
 {
 }