[GRASS-git] [OSGeo/grass-addons] f415ab: r.in.usgs: Update USGS URL, remove unused var (#424)

[Vaclav Petras]

  Branch: refs/heads/master
  Home:   https://github.com/OSGeo/grass-addons
  Commit: f415abb065925bed53bda17b6a3f6d35ef142d94
      https://github.com/OSGeo/grass-addons/commit/f415abb065925bed53bda17b6a3f6d35ef142d94
  Author: Vaclav Petras <wenzeslaus at gmail.com>
  Date:   2021-02-02 (Tue, 02 Feb 2021)

  Changed paths:
    M grass7/raster/r.in.usgs/r.in.usgs.py

  Log Message:
  -----------
  r.in.usgs: Update USGS URL, remove unused var (#424)

USGS changed the base API URL.

dataset_name was unused, but the new USGS JSON has datasets as an empty list,
so the [0] access was failing. Removing dataset_name code.