MDL-81936 editor_tiny: handle default filepicker/draftitem config.

If they aren't passed in editor options config, ensure they still
observe the registered option processor (type) for each.

lib/editor/tiny/classes/editor.php

@@ -170,7 +170,10 @@ class editor extends \texteditor {
             'context' => $context->id,
 
             // File picker options.
-            'filepicker' => $fpoptions,
+            'filepicker' => (object) $fpoptions,
+
+            // Default draft item ID.
+            'draftitemid' => 0,
 
             'currentLanguage' => current_language(),