Fix typo in CC-BY 4.0 license url.

media_attribution.default.licenses.yml

@@ -3,7 +3,7 @@
   title: Attribution 4.0 International (CC BY 4.0)
   short_label: CC BY 4.0
   icon_file: by.png
-  url: https://creativecommons.org/icenses/by/4.0/
+  url: https://creativecommons.org/licenses/by/4.0/
 -
   title: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
   short_label: CC BY-NC 4.0