Removing a workaround to make NevigationModeSwitchRule pass on CF

Change-Id: I7b7cabc098f17c99406032e186a4ee363273f0a9
diff --git a/quickstep/tests/src/com/android/quickstep/NavigationModeSwitchRule.java b/quickstep/tests/src/com/android/quickstep/NavigationModeSwitchRule.java
index fa4c7b9..5606ac2 100644
--- a/quickstep/tests/src/com/android/quickstep/NavigationModeSwitchRule.java
+++ b/quickstep/tests/src/com/android/quickstep/NavigationModeSwitchRule.java
@@ -209,7 +209,6 @@
                     final String error = mLauncher.getNavigationModeMismatchError();
                     assertTrue("Switching nav mode: " + error, error == null);
 
-                    Thread.sleep(5000);
                     return true;
                 }