There is not really a reason to have different completepopup settings
depending on if the LSP server supports lazy documentation or not:
In both cases info may be displayed, the only difference being that with
"resolveProvider" the info is to be fetched on demand.
But for both scenarios the formatting of the info popup should be the
same.
This fixes a problem, where in the non-lazydoc branch the info popup is
colored with the PmenuSel highlight group, which is a little bit ugly
when the content is syntax highlighted as well.