Start map feature ids at 1

[tusbar]

Starting with 0 seems to break mapbox-gl, resulting in an undefined id.
This fixes the highlight on the first feature of a dataset.

See https://geo.data.gouv.fr/en/datasets/6d0dfdf2ccb4c6f3fea807d3764b9fe49eb263f7

[buildsize]

File name	Previous Size	New Size	Change
page-_error.js.gz	172 bytes	172 bytes	0 bytes (0%)
page-catalog.js.gz	57.58 KB	57.58 KB	0 bytes (0%)
page-catalogs.js.gz	3.71 KB	3.71 KB	0 bytes (0%)
page-dataset.js.gz	18.54 KB	18.54 KB	0 bytes (0%)
page-doc-publish-your-data.js.gz	3.75 KB	3.75 KB	0 bytes (0%)
page-doc.js.gz	1.92 KB	1.92 KB	0 bytes (0%)
page-events.js.gz	2.47 KB	2.47 KB	0 bytes (0%)
page-harvest.js.gz	3.14 KB	3.14 KB	0 bytes (0%)
page-index.js.gz	6.24 KB	6.24 KB	0 bytes (0%)
page-legal.js.gz	853 bytes	853 bytes	0 bytes (0%)
page-publication-datasets.js.gz	6.14 KB	6.14 KB	0 bytes (0%)
page-publication-organization.js.gz	9.76 KB	9.76 KB	0 bytes (0%)
page-publication-producers.js.gz	5.67 KB	5.67 KB	0 bytes (0%)
page-publication.js.gz	3.88 KB	3.88 KB	0 bytes (0%)
page-search.js.gz	7.99 KB	7.99 KB	0 bytes (0%)
page-doc-link-proxy.js.gz	1.49 KB	1.49 KB	0 bytes (0%)
page-embed-preview.js.gz	4.62 KB	4.62 KB	0 bytes (0%)
chunk-dataset_downloads_preview_table.js.gz	12.96 KB	12.96 KB	0 bytes (0%)
page-_app.js.gz	2.78 KB	2.78 KB	0 bytes (0%)
static-commons-main-[hash].js.gz	136.06 KB	136.07 KB	4 bytes (0%)
chunk-centered_map_map.js.gz	171.8 KB	171.8 KB	0 bytes (0%)

[codecov-io]

Codecov Report

Merging #652 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #652   +/-   ##
=====================================
  Coverage     4.9%   4.9%           
=====================================
  Files         112    112           
  Lines        1489   1489           
=====================================
  Hits           73     73           
  Misses       1416   1416

Impacted Files	Coverage Δ
components/centered-map/enhance-map-data.js	0% <ø> (ø)	⬆️

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[tusbar]

Fixed in mapbox/mapbox-gl-js#6938