Re-add n_segments argument to line_segment()

[Robinlovelace]

As shown here the argument was lost: https://github.com/ropensci/stplanr/compare/v1.1.2..HEAD

That caused a reverse dependency fail on CRAN's auto checks:

package stplanr_1.2.0.tar.gz has been auto-processed. The auto-check found problems when checking the first order strong reverse dependencies.
Please reply-all and explain: Is this expected or do you need to fix anything in your package? If expected, have all maintainers of affected packages been informed well in advance? Are there false positives in our results?

*** Changes to worse in reverse dependencies ***
Debian: https://win-builder.r-project.org/incoming_pretest/stplanr_1.2.0_20240425_131510/reverseDependencies/summary.txt
agricolaeplotr

Log dir: https://win-builder.r-project.org/incoming_pretest/stplanr_1.2.0_20240425_131510/
The files will be removed after roughly 7 days.

Pretests:
Windows: https://win-builder.r-project.org/incoming_pretest/stplanr_1.2.0_20240425_131510/Windows/00check.log
Debian: https://win-builder.r-project.org/incoming_pretest/stplanr_1.2.0_20240425_131510/Debian/00check.log

Last published version on CRAN:

[Robinlovelace]

Checking with

revdepcheck::revdep_check()