Client side vote kick changes - tab closes now. Server side fixes.

src/net/common/clientthread.cpp

@@ -1037,6 +1037,18 @@ ClientThread::StartPetition(unsigned petitionId, unsigned proposingPlayerId, uns
 	}
 }
 
+void
+ClientThread::EndPetition(unsigned petitionId)
+{
+	bool isCurPetition;
+	{
+		boost::mutex::scoped_lock lock(m_curPetitionIdMutex);
+		isCurPetition = m_curPetitionId == petitionId;
+	}
+	if (isCurPetition)
+		GetGui().endVoteOnKick();
+}
+
 void
 ClientThread::UpdateStatData(const ServerStats &stats)
 {