Fix message format in org-notmuch-search-open
* org-notmuch.el (org-notmuch-search-open): Bug fix
When opening a notmuch-search link, we use =message= to display the
path at the bottom of the screen. This would signal "Not enough
arguments for format string" when the path contained %-signs, as it is
likely to when the query contains spaces:
[[notmuch-search:tag:inbox%2520not%2520tag:bulk%2520org]]
That query appears to be double-escaped, which also might contribute
to the problem, but either way: we should use =(message "%s" str)= to
print arbitrary strings, not =(message str)=.