Corrected debug message in WindowManager

When WindowManager reports "Key dispatching timed out"
it prints out information about the window state that was
present at the time the key was sent to that window.
There is a minor error in the class representing the
recorded window state so that the currently focused window
is printed instead of the recorded focused window.

Change-Id: I29a5471ef725e30f812ffd57fd4597ce81c0c7f2

Author: Johan Alfven

services/java/com/android/server/WindowManagerService.java

@@ -5478,7 +5478,7 @@ public String toString() {
                         + " fin=" + finished + " gfw=" + gotFirstWindow
                         + " ed=" + eventDispatching + " tts=" + timeToSwitch
                         + " wf=" + wasFrozen + " fp=" + focusPaused
-                        + " mcf=" + mCurrentFocus + "}}";
+                        + " mcf=" + curFocus + "}}";
             }
         };
         private DispatchState mDispatchState = null;