Correct flickr url generation.

The urls for images in flickr was getting wrong. Setting it to the right
thing as per http://www.flickr.com/services/api/misc.urls.html

Note: Couldn't test this locally because of the curl error, so please test
before merging

Bug 46559

Change-Id: I57900feba9eafc5c4790b17459c857bccdf9e236
Merge "Correct flickr url generation."