Fixup lsp_location_item_to_vim (#657)
Fixup lsp_location_item_to_vim (#657)

Refactoring introduced an additional +1 to line numbers; correct it for `PeekDefinition`.

see discussion on https://github.com/prabirshrestha/vim-lsp/pull/647
prabirshrestha/vim-lsp,prabirshrestha/vim-lsp