remove more global references (#7442)

app/command_me.go

@@ -33,6 +33,6 @@ func (me *MeProvider) GetCommand(T goi18n.TranslateFunc) *model.Command {
 	}
 }
 
-func (me *MeProvider) DoCommand(args *model.CommandArgs, message string) *model.CommandResponse {
+func (me *MeProvider) DoCommand(a *App, args *model.CommandArgs, message string) *model.CommandResponse {
 	return &model.CommandResponse{ResponseType: model.COMMAND_RESPONSE_TYPE_IN_CHANNEL, Text: "*" + message + "*"}
 }