Remove additionalFilePaths field when saving config (#4674)
Remove additionalFilePaths field when saving config (#4674)

Fixes #4666
switch-education/pxt,playi/pxt,switch-education/pxt,switchinnovations/pxt,Microsoft/pxt,Microsoft/pxt,switch-education/pxt,Microsoft/pxt,Microsoft/pxt,playi/pxt,playi/pxt,switch-education/pxt,playi/pxt,switch-education/pxt,Microsoft/pxt,switchinnovations/pxt,switchinnovations/pxt,switchinnovations/pxt