Update file_path parameter to file_name
Update file_path parameter to file_name

Fixes mismatch in `submit_malware` action.
pidah/st2contrib,pearsontechnology/st2contrib,armab/st2contrib,lmEshoo/st2contrib,tonybaloney/st2contrib,psychopenguin/st2contrib,pearsontechnology/st2contrib,pidah/st2contrib,armab/st2contrib,pearsontechnology/st2contrib,pearsontechnology/st2contrib,tonybaloney/st2contrib,armab/st2contrib,digideskio/st2contrib,StackStorm/st2contrib,pidah/st2contrib,tonybaloney/st2contrib,psychopenguin/st2contrib,lmEshoo/st2contrib,digideskio/st2contrib,StackStorm/st2contrib,StackStorm/st2contrib