Disables dynamic import from Meteor

[houshuang]

PSA: Meteor team discourages use of Picker: meteor/meteor#9653 (comment)

Specifically, it disables the dynamic import functionality.

[jeffreyflynt]

If you need time to change out this, you can use this in the meantime:
Picker.filterFunction = req => !req.url.startsWith('/__meteor__/');