Make quote props consistent, white circle dark theme play overlay

Prevents errors in the logs about attempting to load images from their
relative patn instead of the absolute path. No effect on the user.

js/models/conversations.js

@@ -800,7 +800,7 @@
               thumbnail: thumbnail
                 ? {
                     ...(await loadAttachmentData(thumbnail)),
-                    path: getAbsoluteAttachmentPath(thumbnail.path),
+                    objectUrl: getAbsoluteAttachmentPath(thumbnail.path),
                   }
                 : null,
             };