import request payload is larger for GPSIO than for import-from-file

[caver456]

See #14 - not sure why the payload is larger; would be nice to get it to be identical to the payload from import-from-file.

Import-from-file payload, for a single file in the Garmin/GPX directory:

json: {"contents":["PD94bWwgdmVyc2lvbj0iMS4wIj8+CjxncHggeG1sbnM9Imh0dHA6Ly93d3cudG9wb2dyYWZpeC5jb20vR1BYLzEvMSIgeG1sbnM6Z3B4eD0iaHR0cDovL3d3dy5nYXJtaW4uY29tL3htbHNjaGVtYXMvR3B4RXh0ZW5zaW9ucy92MyIgY3JlYXRvcj0iQ0FMVE9QTyIgdmVyc2lvbj0iMS4xIj48d3B0IGxhdD0iMzguOTM2ODYxMjc4MzQ1NSIgbG9uPSItMTIwLjk4Nzg5MDYyNSI+PG5hbWU+dDI8L25hbWU+PC93cHQ+PC9ncHg+"]}

Import-from-GPSIO payload, when that same file is the only gpx file in that directory:

json: {"contents":["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"]}

Note that this was recorded using the final proposed main.js (Oct 30 2021) file, noted in #14 as a chrome local override. Editing that file again to produce identical payload would be required.