journey-test: xjava -> java

bin/journey-test.sh

@@ -3,7 +3,7 @@
 # This script is shared between the Java and Kotlin tracks.  If you make an update to this script on
 # one track, please create a companion PR to merge it in to the other.  Thank you!
 TRACK=java
-TRACK_REPO="x${TRACK}"
+TRACK_REPO="$TRACK"
 TRACK_SRC_EXT="java"
 
 on_exit() {