Take into account the source directory when parsing org-mode in Organic.

Previously only the emacs code was doing this.

src/context/global_settings.rs

@@ -14,7 +14,9 @@ impl<'g, 's> GlobalSettings<'g, 's> {
     pub fn new() -> GlobalSettings<'g, 's> {
         GlobalSettings {
             radio_targets: Vec::new(),
-            file_access: &LocalFileAccessInterface,
+            file_access: &LocalFileAccessInterface {
+                working_directory: None,
+            },
         }
     }
 }