FIX: Brain Line2D

[GuillaumeFavelier]

This PR fixes the issue with:

Traceback (most recent call last):
  File "/home/circleci/project/mne/viz/_brain/_brain.py", line 50, in safe_event
    return fun(*args, **kwargs)
  File "/home/circleci/project/mne/viz/_brain/_brain.py", line 690, in _clean
    self.clear_glyphs()
  File "/home/circleci/project/mne/viz/_brain/_brain.py", line 1701, in clear_glyphs
    self.rms.remove()
TypeError: remove() takes exactly one argument (0 given)

[larsoner]

Could we update a test that would have caught this?

[larsoner]

I'll merge this to get things green in main but a test at some point would be good!

[GuillaumeFavelier]

Some tests crashed but the TypeError has been raised in test_single_hemi:

Traceback (most recent call last):
  File "/home/runner/work/mne-python/mne-python/mne/viz/_brain/_brain.py", line 1219, in _set_annot
    self.clear_glyphs()
  File "/home/runner/work/mne-python/mne-python/mne/viz/_brain/_brain.py", line 1701, in clear_glyphs
    self.rms.remove()
TypeError: remove() takes exactly one argument (0 given)

https://github.com/mne-tools/mne-python/runs/1993712050#step:13:3006