[BUG] Dash pages callback not fully hidden

[antonymilne]

A small issue with the new features in Dash 3.4.0.

#3542 set the Dash pages callback to hidden=True but forgot to set the accompanying clientside callback to hidden=True:

dash/dash/dash.py

Line 2685 in 4189c49

self.clientside_callback(

This should also be hidden=True to avoid this appearing in the callback graph:

[l0uden]

I will do it