EXT-1199 Small layout tweaks, EXT-927 'Block object by name' dialog is broken

indra/newview/skins/default/xui/en/accordion_parent.xml

indra/newview/skins/default/xui/en/floater_mute_object.xml

indra/newview/skins/default/xui/en/floater_ui_preview.xml

indra/newview/skins/default/xui/en/panel_login.xml

indra/newview/skins/default/xui/en/widgets/accordion_tab.xml

indra/newview/skins/default/xui/en/widgets/filter_editor.xml

indra/newview/skins/default/xui/en/widgets/scroll_list.xml