fix inlay hint list separator (#1438)

fix #1430 

It lead wrong format.

Author: CoelacanthusHex

autoload/lsp/internal/inlay_hints.vim

@@ -22,7 +22,7 @@ function! s:set_inlay_hints(data) abort
         endif
         let l:label = ''
         if type(l:hint.label) ==# v:t_list
-            let l:label = join(map(copy(l:hint.label), {_,v -> v.value}), ', ')
+            let l:label = join(map(copy(l:hint.label), {_,v -> v.value}), '')
         else
             let l:label = l:hint.label
         endif