Fixed a boat bearing bug.

- server should send LastPastCorner's heading bearing, instead of headingCorner's bearing

#story[715]

src/main/java/seng302/server/ServerThread.java

@@ -265,7 +265,7 @@ public class ServerThread implements Runnable, Observer {
         for (Boat b : ((Simulator) o).getBoats()){
             try {
                 Message m = new BoatLocationMessage(b.getSourceID(), 1, b.getLat(),
-                        b.getLng(), b.getHeadingCorner().getBearingToNextCorner(),
+                        b.getLng(), b.getLastPassedCorner().getBearingToNextCorner(),
                         ((long) b.getSpeed()));
                 server.send(m);
             } catch (IOException e) {