[fix] Fix bug that caused bulk actions to retain the num_objects after the action
[fix] Fix bug that caused bulk actions to retain the num_objects after the action

wagtail/wagtail,mixxorz/wagtail,wagtail/wagtail,torchbox/wagtail,wagtail/wagtail,torchbox/wagtail,thenewguy/wagtail,torchbox/wagtail,thenewguy/wagtail,mixxorz/wagtail,rsalmaso/wagtail,thenewguy/wagtail,rsalmaso/wagtail,zerolab/wagtail,thenewguy/wagtail,mixxorz/wagtail,zerolab/wagtail,thenewguy/wagtail,wagtail/wagtail,jnns/wagtail,jnns/wagtail,rsalmaso/wagtail,rsalmaso/wagtail,zerolab/wagtail,jnns/wagtail,zerolab/wagtail,wagtail/wagtail,jnns/wagtail,mixxorz/wagtail,rsalmaso/wagtail,zerolab/wagtail,mixxorz/wagtail,torchbox/wagtail