Add missing arg for <Plug>(lsp-workspace-symbol) (#925)

Author: seandewar

plugin/lsp.vim

@@ -138,7 +138,7 @@ nnoremap <plug>(lsp-rename) :<c-u>call lsp#ui#vim#rename()<cr>
 nnoremap <plug>(lsp-type-definition) :<c-u>call lsp#ui#vim#type_definition(0)<cr>
 nnoremap <plug>(lsp-type-hierarchy) :<c-u>call lsp#ui#vim#type_hierarchy()<cr>
 nnoremap <plug>(lsp-peek-type-definition) :<c-u>call lsp#ui#vim#type_definition(1)<cr>
-nnoremap <plug>(lsp-workspace-symbol) :<c-u>call lsp#ui#vim#workspace_symbol()<cr>
+nnoremap <plug>(lsp-workspace-symbol) :<c-u>call lsp#ui#vim#workspace_symbol('')<cr>
 nnoremap <plug>(lsp-document-format) :<c-u>call lsp#ui#vim#document_format()<cr>
 vnoremap <plug>(lsp-document-format) :<Home>silent <End>call lsp#ui#vim#document_range_format()<cr>
 nnoremap <plug>(lsp-document-range-format) :<c-u>set opfunc=lsp#ui#vim#document_range_format_opfunc<cr>g@