fix: remove deprecated load from library

[vincentullmann]

Changelog Description

remove deprecated Library... option form the menu

Additional review information

host_tools.show_library_loader was removed in ynput/ayon-core#1856

Traceback (most recent call last):
  File "/mnt/home/vincent.ullmann/.local/share/AYON/addons/nuke_0.4.10/ayon_nuke/api/pipeline.py", line 319, in <lambda>
    lambda: host_tools.show_library_loader(
AttributeError: module 'ayon_core.tools.utils.host_tools' has no attribute 'show_library_loader'

Testing notes:

1. start with this step
2. follow this step