emacs: make the refresh functions more consistent

The different refreshed functions were called differently: some were
called interactively and some were not. Make them all interactive.

emacs/notmuch-hello.el

@@ -607,6 +607,7 @@ with `notmuch-hello-query-counts'."
 (defun notmuch-hello-update (&optional no-display)
   "Update the current notmuch view."
   ;; Lazy - rebuild everything.
+  (interactive)
   (notmuch-hello no-display))
 
 (defun notmuch-hello-window-configuration-change ()

emacs/notmuch-lib.el

@@ -417,10 +417,8 @@ of its command symbol."
   "Refresh the current buffer."
   (interactive)
   (when notmuch-buffer-refresh-function
-    (if (commandp notmuch-buffer-refresh-function)
-	;; Pass prefix argument, etc.
-	(call-interactively notmuch-buffer-refresh-function)
-      (funcall notmuch-buffer-refresh-function))))
+    ;; Pass prefix argument, etc.
+    (call-interactively notmuch-buffer-refresh-function)))
 
 (defun notmuch-poll-and-refresh-this-buffer ()
   "Invoke `notmuch-poll' to import mail, then refresh the current buffer."

emacs/notmuch.el

@@ -991,6 +991,7 @@ query string as the current search. If the current thread is in
 the new search results, then point will be placed on the same
 thread. Otherwise, point will be moved to attempt to be in the
 same relative position within the new buffer."
+  (interactive)
   (let ((target-line (line-number-at-pos))
 	(oldest-first notmuch-search-oldest-first)
 	(target-thread (notmuch-search-find-thread-id 'bare))