Add change trigger on raw_id_fields for m2m

[leibowitz]

Looks like the change function is not triggered if the field value is changed when using the raw_id_fields (popup).
Adding the trigger by overwriting dismissRelatedLookupPopup is necessary until django admin fixes this.

Similar to how dismissAddAnotherPopup is changed as well.

Open to feedback on how to do this better

[coveralls]

Coverage remained the same at 89.588% when pulling 7b3cc33 on leibowitz:add_change_trigger into e7fe61b on digi604:master.

[blag]

Thanks!