Autofocus on user input when adding by URIs

Set textarea for URI input to autofocus since this is the field the user is most likely to be pasting text into.

index.html

@@ -728,7 +728,7 @@ http://ex1.com/f1.jpg http://ex2.com/f1.jpg
 http://ex1.com/f2.mp4 http://ex2.com/f2.mp4 --out=file2.mp4
 </pre>
       </p>
-      <textarea rows="4" style="width: 100%" ng-model="getUris.uris"></textarea>
+      <textarea rows="4" style="width: 100%" ng-model="getUris.uris" autofocus></textarea>
 
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