Fix a bug in GenericCAO GENERIC_CMD_UPDATE_POSITION parsing.

Author: xyzz

src/content_cao.cpp

@@ -1649,6 +1649,8 @@ class GenericCAO : public ClientActiveObject
 			m_acceleration = readV3F1000(is);
 			if(fabs(m_prop.automatic_rotate) < 0.001)
 				m_yaw = readF1000(is);
+			else
+				readF1000(is);
 			bool do_interpolate = readU8(is);
 			bool is_end_position = readU8(is);
 			float update_interval = readF1000(is);