Update fixtures

...tests/RepresentativeDetailTest/test_mandates_display.html

...sponse_fixtures/GroupListTest.test_active_parties.content

.../response_fixtures/GroupListTest.test_all_parties.content

...xtures/RepresentativeListTest.test_filter_chamber.content

...stTest.test_page1_paginateby12_active_displaylist.content

...eListTest.test_page1_paginateby12_all_displaylist.content

...stTest.test_page1_paginateby24_active_displaygrid.content

...eListTest.test_page1_paginateby24_all_displaygrid.content

...ativeListTest.test_page2_paginateby12_displaylist.content