Remove a stray reference to ChooserPanels (#8360)
Remove a stray reference to ChooserPanels (#8360)

These are no longer required in Wagtail 3
wagtail/wagtail,zerolab/wagtail,thenewguy/wagtail,zerolab/wagtail,rsalmaso/wagtail,thenewguy/wagtail,wagtail/wagtail,wagtail/wagtail,thenewguy/wagtail,zerolab/wagtail,rsalmaso/wagtail,zerolab/wagtail,zerolab/wagtail,thenewguy/wagtail,rsalmaso/wagtail,rsalmaso/wagtail,rsalmaso/wagtail,wagtail/wagtail,wagtail/wagtail,thenewguy/wagtail