Fixed error in media gallery

app/javascript/flavours/glitch/components/media_gallery.jsx

@@ -111,6 +111,10 @@ class Item extends PureComponent {
     
     let width  = 100;
     let height = 100;
+    let top    = 'auto';
+    let left   = 'auto';
+    let bottom = 'auto';
+    let right  = 'auto';
 
     let root = Math.sqrt(size);
     let numCols = Math.ceil(root);