[Task] Update filing jsons for proper LEI format

[jcadam14]

Update the three dev_setup/mockdata/test*.json files to have LEIs to that conform to the regex ^[A-Z0-9]{4}00[A-Z0-9]{12}\d{2}$

Primarily, the 5th and 6th character must be 0s, and the final two characters must be digits.

[jcadam14]

Closing this to https://github.com/cfpb/sbl-project/pull/218