deskutils/go-for-it: unbreak build with vala 0.36

/wrkdirs/usr/ports/deskutils/go-for-it/work/Go-For-It-release_v1.5/src/TaskStore.vala:89.22-89.25: error: Argument 1: Cannot pass value to reference or output parameter

this.remove (iter);
             ^^^^

While I'm here, pet portlint, USE_* comes before USES

PR: 222036
Submitted by: cpm
Approved by: Neel Chauhan <neel@neelc.org> (maintainer)