PasswordSlotManager: Fix incorrect string comparison.

Bug: 135721162
Test: cts-on-gsi -m CtsWindowManagerDeviceTestCases
Change-Id: I2a11dd6dfd44e10400e40ebbaa2ed597de95cdcb
Merged-In: I2a11dd6dfd44e10400e40ebbaa2ed597de95cdcb
(cherry picked from commit 2f809b0b7d427fd14c74adccfab704baac915a52)
diff --git a/services/core/java/com/android/server/locksettings/PasswordSlotManager.java b/services/core/java/com/android/server/locksettings/PasswordSlotManager.java
index 5cbd237..4ef63c0 100644
--- a/services/core/java/com/android/server/locksettings/PasswordSlotManager.java
+++ b/services/core/java/com/android/server/locksettings/PasswordSlotManager.java
@@ -122,7 +122,7 @@
      */
     public void markSlotDeleted(int slot) throws RuntimeException {
         ensureSlotMapLoaded();
-        if (mSlotMap.containsKey(slot) && mSlotMap.get(slot) != getMode()) {
+        if (mSlotMap.containsKey(slot) && !mSlotMap.get(slot).equals(getMode())) {
             throw new RuntimeException("password slot " + slot + " cannot be deleted");
         }
         mSlotMap.remove(slot);