fix: don't check limits for view.soma
fix: don't check limits for view.soma

view.soma does not set the limits, making this completely dependent on
matplotlib settings.

Fixes #466.

BlueBrain/NeuroM,eleftherioszisis/NeuroM,liesbethvanherpe/NeuroM,lidakanari/NeuroM,mgeplf/NeuroM,wizmer/NeuroM,juanchopanza/NeuroM