Tell Flowplayer to preserve video's aspect ratio

Bug 1496910

behatnotneeded: Has only a visual impact, can't be tested by Behat

Change-Id: I2b531c92ed46ad3b364206161ff6851314749573
(cherry picked from commit caa62e2e)

htdocs/artefact/file/blocktype/internalmedia/lib.php

@@ -307,7 +307,8 @@ class PluginBlocktypeInternalmedia extends PluginBlocktype {
                        url: "'.$escapedurl.'",
                        '.$type.'
                        autoPlay: false,
-                       autoBuffering: '.$buffering.'
+                       autoBuffering: '.$buffering.',
+                       scaling: "fit",
                    },
                    plugins: {
 	                  controls: {