Revert "Don't request PIN field focus again unless re-enabled"

This reverts commit 3ce118c58c.

Reason for revert: The culprit candicate CL of b/190128793. Not that this revert is just to verify if it is the real culprit of b/190128793. Doesn't mean it must be reverted
Bug: b/190128793

Change-Id: Ibd580df35590ecf0c75f6004db900b9d4aafb03a

packages/SystemUI/src/com/android/keyguard/KeyguardPinBasedInputView.java

@@ -62,10 +62,9 @@ public abstract class KeyguardPinBasedInputView extends KeyguardAbsKeyInputView
 
     @Override
     protected void setPasswordEntryEnabled(boolean enabled) {
-        boolean wasEnabled = mPasswordEntry.isEnabled();
         mPasswordEntry.setEnabled(enabled);
         mOkButton.setEnabled(enabled);
-        if (enabled && !wasEnabled && !mPasswordEntry.hasFocus()) {
+        if (enabled && !mPasswordEntry.hasFocus()) {
             mPasswordEntry.requestFocus();
         }
     }