The .oo-ui-popupToolGroup-handle styles only need to apply to the
editTools toolbar, where they override OOUI styles so that our
"stretched" toolbar works; they don't need to apply to the pageTools
toolbar, which contains just the editor switcher, and where they make
it look different from the MF wikitext editor toolbar for no reason.
Change-Id: I21315b34be0a7c3938f84ada720ff5754d953879