Call modules for /MODE done by not-in-channel nicks

When ChanServ ops someone in a channel without joining first, znc didn't call
modules for this event, because it couldn't figure out a CNick* instance to use

Instead, the module hooks are now executed with a temporary CNick instance which
is created by CIRCSock anyway.

Big thanks to Robby for reporting this and helping me test it!

Signed-off-by: Uli Schlachter <psychon@znc.in>

IRCSock.cpp

@@ -500,7 +500,7 @@ void CIRCSock::ReadLine(const CString& sData) {
 
 			CChan* pChan = m_pUser->FindChan(sTarget);
 			if (pChan) {
-				pChan->ModeChange(sModes, Nick.GetNick());
+				pChan->ModeChange(sModes, &Nick);
 
 				if (pChan->IsDetached()) {
 					return;