Core/AuthServer: Allow reauthentication to the authserver on realm logout. Thanks to .. someone (webmaster?)

Fixes issue 4191.

--HG--
branch : trunk

src/server/authserver/Server/AuthSocket.cpp

@@ -741,6 +741,13 @@ bool AuthSocket::_HandleReconnectChallenge()
         return false;
     }
 
+    // Reinitialize build, expansion and the account securitylevel
+    _build = ch->build;
+    _expversion = (AuthHelper::IsPostBCAcceptedClientBuild(_build) ? POST_BC_EXP_FLAG : NO_VALID_EXP_FLAG) | (AuthHelper::IsPreBCAcceptedClientBuild(_build) ? PRE_BC_EXP_FLAG : NO_VALID_EXP_FLAG);
+
+    uint8 secLevel = fields[2].GetUInt8();
+    _accountSecurityLevel = secLevel <= SEC_ADMINISTRATOR ? AccountTypes(secLevel) : SEC_ADMINISTRATOR;
+
     K.SetHexStr ((*result)[0].GetCString());
 
     // Sending response