org-capture: Fix bug when capturing with templates using `function'

* org-capture.el (org-capture): Store :return-to-wconf
earlier.
(org-capture-place-template): Don't store :return-to-wconf
when called from a capture template using `function', rely on
the early :return-to-wconf value store from `org-capture'.

Thanks to Brett Viren for raising this issue.

lisp/org-capture.el

@@ -577,8 +577,9 @@ of the day at point (if any) or the current HH:MM time."
 			      (file-name-nondirectory
 			       (buffer-file-name orig-buf)))
 			 :annotation annotation
-			 :initial initial)
-	(org-capture-put :default-time
+			 :initial initial
+			 :return-to-wconf (current-window-configuration)
+			 :default-time
 			 (or org-overriding-default-time
 			     (org-current-time)))
 	(org-capture-set-target-location)
@@ -593,7 +594,8 @@ of the day at point (if any) or the current HH:MM time."
 	    ;;insert at point
 	    (org-capture-insert-template-here)
 	  (condition-case error
-	      (org-capture-place-template)
+	      (org-capture-place-template
+	       (equal (car (org-capture-get :target)) 'function))
 	    ((error quit)
 	     (if (and (buffer-base-buffer (current-buffer))
 		      (string-match "\\`CAPTURE-" (buffer-name)))
@@ -986,9 +988,12 @@ it.  When it is a variable, retrieve the value.  Return whatever we get."
 	  (ignore-errors (org-set-local (car v) (cdr v))))
 	(buffer-local-variables buffer)))
 
-(defun org-capture-place-template ()
-  "Insert the template at the target location, and display the buffer."
-  (org-capture-put :return-to-wconf (current-window-configuration))
+(defun org-capture-place-template (&optional inhibit-wconf-store)
+  "Insert the template at the target location, and display the buffer.
+When `inhibit-wconf-store', don't store the window configuration, as it
+may have been stored before."
+  (unless inhibit-wconf-store
+    (org-capture-put :return-to-wconf (current-window-configuration)))
   (delete-other-windows)
   (org-switch-to-buffer-other-window
    (org-capture-get-indirect-buffer (org-capture-get :buffer) "CAPTURE"))