org-mu4e: fix org-mu4e-store-and-capture for Org 9.0

As discussed in #947, links need to be redefined for Org 9. This is
fixed in
[b885dd3](b885dd308e). At
the same time, `org-mu4e-store-and-capture` is still using
`org-mu4e-store-link` only, so it doesn't work in Org 9. Fix it
by interactively calling `org-store-link` instead.

mu4e/org-mu4e.el

@@ -138,7 +138,7 @@ the query (for paths starting with 'query:')."
 `org-mu4e-link-query-in-headers-mode', and capture it with
 org-mode)."
   (interactive)
-  (org-mu4e-store-link)
+  (call-interactively 'org-store-link)
   (org-capture))