Use `geomap=True` for plotting existing lines

[zoltanmaric]

Since https://github.com/PyPSA/PyPSA/commit/e754928e#diff-1ffb543f39b9a9c1d00adfc3fb2c1a89c905c56e00b9ede9178787a8148dc0eeR210 PyPSA raises an exception for plots that have geo axes but use geomap=False.

Checklist

• [x] I tested my contribution locally and it seems to work fine.
• [x] Code and workflow changes are sufficiently documented.
• [x] Newly introduced dependencies are added to envs/environment.yaml and envs/environment.docs.yaml.
• [x] Changes in configuration options are added in all of config.default.yaml, config.tutorial.yaml, and test/config.test1.yaml.
• [x] Changes in configuration options are also documented in doc/configtables/*.csv and line references are adjusted in doc/configuration.rst and doc/tutorial.rst.
• [x] A note for the release notes doc/release_notes.rst is amended in the format of previous release notes.

[zoltanmaric]

Hi @FabianHofmann, some of the checks seem to have timed out. Could you please rerun them manually, so that this gets merged?

[zoltanmaric]

This time it sounds like the macos/latest build failed because the retrieve_ship_raster job failed to download shipdensity_global.zip (i.e. the file was corrupted)