SL-18977 Borders of inventory view in inventory floater seem to be cut a bit

indra/llui/llbutton.cpp

indra/llui/llscrollcontainer.cpp

indra/llui/lltabcontainer.cpp

indra/newview/llinventorypanel.cpp

indra/newview/llpanelmaininventory.cpp

.../newview/skins/default/xui/en/panel_inventory_gallery.xml

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

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