[tools][CouchDB_MRI_Importer] Fix date in MRI data

[charlottesce]

Brief summary of changes

The first change in this PR is changing the order of arguments in the function call to join(), as I got the following error while running the script initially:

Then, it fixes the date format {total number of seconds} to a proper YYYY-mm-dd format, for "FileInsert{date}" variables from

to:

Testing instructions (if applicable)

1. Run the CouchDB_Import_MRI.php script
2. Make sure the variables starting with FileInsert{date} e.g. for mri_data, have a correct date format

Note

• This is a CCNA override - https://github.com/aces/CCNA/pull/6371