[EXOT27 in 21.2 DerivationFramework] remove QG tagger variables from EXOT27
This MR removes the QG tagger variables added to the EXOT27 derivation which were introduced in commit b77824a0.
These variables were reported to cause issues in running derivation production for the semi-visible jets team and are not used by an analysis anymore. See ATLASG-1597 for discussion.
Edited by Philipp Gadow