Fix terminate() being called on kicking a player (closing sockets twice is bad)

Also, Boost, why does your is_open() suck..

src/server/game/Server/WorldSocket.cpp

@@ -77,7 +77,12 @@ void WorldSocket::AsyncReadHeader()
         }
         else
         {
-            _socket.close();
+            // _socket.is_open() till returns true even after calling close()
+            try
+            {
+                _socket.close();
+            }
+            catch (std::exception const&  /*ex*/) { }
         }
     });
 }
@@ -152,7 +157,12 @@ void WorldSocket::AsyncReadData(size_t dataSize)
         }
         else
         {
-            _socket.close();
+            // _socket.is_open() till returns true even after calling close()
+            try
+            {
+                _socket.close();
+            }
+            catch (std::exception const&  /*ex*/) {}
         }
     });
 }