ticklen will reset labels when labels = "both" are given

[cvanelteren]

This might be the same bug, so I posted here.

import ultraplot as pplt
print("Ultraplot version:", pplt.__version__)
fig,ax=pplt.subplot(proj='cyl')
ax.format(labels='both', ticklen=.5)

Set ticklen override labels='both'.

Originally posted by @gepcel in #518 (comment)