Fix: (view--add-todo-face) Bind org-done-keywords

org-get-todo-face uses org-done-keywords, which is a buffer-local
variable, so it may be nil in the context that
org-ql-view--add-todo-face is called.  See,
e.g. org-agenda-highlight-todo, which does the same thing.

Thanks to Yiming Chen (@dsdshcym).

README.org

@@ -394,6 +394,7 @@ Expands into a call to ~org-ql-select~ with the same arguments.  For convenience
 *Fixed*
 +  Call =helm-make-source= directly instead of using =helm-build-sync-source= macro.  (Fixes [[https://github.com/alphapapa/org-ql/issues/60][#60]].  Thanks to [[https://github.com/matthuszagh][Matt Huszagh]] for reporting.)
 +  Search/view buffers now always end with a newline, which prevents side-scrolling of the window when calling =end-of-buffer=.
++  Face for done to-do keywords in =org-ql-view= buffers.  (Thanks to [[https://github.com/dsdshcym][Yiming Chen]].)
 
 *Internal*
 +  Added generic node data cache to speed up recursive, tree-based queries.