Support id as valid filter field

[saba-mo]

While working on a client app, I noticed that 'id' was not supported when included in the filterChooserModel's fieldSpecs. This is presumably because 'id' is not a field on the record.

This can be reproduced in toolbox by adding 'id' to the column filtering example's filterChooserModel's fieldSpecs.

See also:

• FilterChooser - enhancements #2043
• filterable 'id' field breaks grid defaultContextMenu #2724
• Grid filters throw if id field configured with enableValues:true #3476