Change default CC algorithm. (#2365)

Author: JonathanLennox

jitsi-media-transform/src/main/resources/reference.conf

@@ -3,7 +3,7 @@ jmt {
     estimator {
       // Version of bandwidth estimator to use.  Current supported values are
       // GoogleCc, GoogleCc2.
-      engine = GoogleCc
+      engine = GoogleCc2
 
       initial-bw = 2500 kbps
       min-bw = 30 kbps