Try local filepath

[Robinlovelace]

Update on this @mvl22 I've got a test rnet.pmtiles file in the tiles directory of the repo on this branch:

ls tiles/
dasymetric-2023-12-17.pmtiles  partial-style_oszoom_names.json  rnet_simplified.pmtiles  style_dark_nobuild.json  style_google_nobuild.json     style_opencyclemap.json
data_zones.pmtiles             rnet.pmtiles                     style_CDRC_nobuild.json  style_fastload.json      style_greyscale_nobuild.json  style_satellite.json

Still not working though and not sure why. Any suggestions?