Removes tap continue when done text

This text is hidden by the keyboard, and the continue/keyboard done
button seem more intuitive than with this text.

bug:27063940
Change-Id: I1a4dca31fbf1c1cf9c00a68f0bb00df760992cda

src/com/android/settings/ChooseLockPassword.java

@@ -616,7 +616,7 @@ public class ChooseLockPassword extends SettingsActivity {
                         mHeaderText.setText(error);
                         setNextEnabled(false);
                     } else {
-                        mHeaderText.setText(R.string.lockpassword_press_continue);
+                        mHeaderText.setText(null);
                         setNextEnabled(true);
                     }
                 }