Default plot_2d including run statistics

[yallup]

Describe the bug
Calling plot_2d without chosing which params to plot generically seems to error as it includes logL, nlive and logLbirth, which typically don't play nicely with 2d KDEs

To Reproduce
Using twin_gaussian example from PCLite repo chains (using anesthetic 2.3.0 installed via pip)

import anesthetic as ns
from matplotlib import pyplot as plt
samples=ns.read_chains("chains/twin_gaussian")

#fine because you force it to be scatters
samples.plot_2d(kinds=dict(upper="scatter_2d",lower='scatter_2d'))
#errors due to triangulation errors
samples.plot_2d()

Expected behavior
Default behavior should be all params but not nlive, logl and logl_birth.

Additional context
Might be related to the previous change wrt integer axis names

[williamjameshandley]

Very much related to #324. Can we move the discussion to there, in particular whether we think that default behaviour should be to avoid the nlive logl and logl_birth columns.