bring back debug toolbar (#4865)
bring back debug toolbar (#4865)

* incorrect refactoring of flag

* remove debug mode

switch-education/pxt,switch-education/pxt,playi/pxt,playi/pxt,playi/pxt,switch-education/pxt,Microsoft/pxt,Microsoft/pxt,Microsoft/pxt,switchinnovations/pxt,switch-education/pxt,Microsoft/pxt,switchinnovations/pxt,switch-education/pxt,playi/pxt,switchinnovations/pxt,Microsoft/pxt,switchinnovations/pxt