update command_remove_test.go (fix errcheck issue) (#29177)

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>

server/.golangci.yml

@@ -142,7 +142,6 @@ issues:
         channels/app/slack.go|\
         channels/app/slashcommands/auto_environment.go|\
         channels/app/slashcommands/command_loadtest.go|\
-        channels/app/slashcommands/command_remove_test.go|\
         channels/app/slashcommands/command_test.go|\
         channels/app/slashcommands/helper_test.go|\
         channels/app/status.go|\