[Bugfix:TAGrading] exclude files from peer download zip (#6052)
[Bugfix:TAGrading] exclude files from peer download zip (#6052)

* adding check

* removing uneeded code

Co-authored-by: unknown <f6785f40afc5de295e70b6210e68542c2d24cb5b@rpi.edu>
RCOS-Grading-Server/HWserver,Submitty/Submitty,Submitty/Submitty,RCOS-Grading-Server/HWserver,Submitty/Submitty,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,Submitty/Submitty