Merge pull request #4002 from gwaidacher/patch-1

Update catalogue search_handlers.py

src/oscar/apps/catalogue/search_handlers.py

 from oscar.core.loading import get_class, get_classes, get_model
 
 BrowseCategoryForm = get_class('search.forms', 'BrowseCategoryForm')
-SearchResultsPaginationMixin, SearchHandler = get_classes(
+SearchHandler, SearchResultsPaginationMixin = get_classes(
     'search.search_handlers', ('SearchHandler', 'SearchResultsPaginationMixin'))
 is_solr_supported = get_class('search.features', 'is_solr_supported')
 is_elasticsearch_supported = get_class('search.features', 'is_elasticsearch_supported')