LineStrings don't render in MVTs

[metaxasa]

Describe the bug LineStrings don't render in MVTs

To Reproduce Steps to reproduce the behavior:

1. SET tracks 1 OBJECT '{"type":"LineString","coordinates":[[0,0],[1,1]]}'
2. Retrieve appropriate MVT.
3. Observe no LineString is rendered.

Expected behavior A LineString is shown when retrieving the MVT.

Additional context Looks like the problem is this line that doesn't use the index i in the loop, e.g. p := line.PointAt(0) should be p := line.PointAt(i). Could also add a guard to check we have >= 2 points.

Happy to provide a PR if helpful.

[tidwall]

A PR would be great. Thanks!

[metaxasa]

No problem - here you go! HTH

[metaxasa]

merged