Update T1555.yaml (#1415)
Update T1555.yaml (#1415)

Was failing prereqs due to missing $process value

Co-authored-by: Michael Haag <dbce5dfbcfbab2989a92adc5614b987c58b89765@users.noreply.github.com>
redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team