fix: removed the redundant "All" option from MultipleDropdownFilter #1485
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This fixes an issue where multi-value dropdown has an "all" option, which does not do anything and is redundant:


This was solved for checkboxes, so I am just following the pattern in checkboxes:
django-unfold/src/unfold/contrib/filters/admin/choice_filters.py
Lines 27 to 31 in bbc6da4