Change nullability of inheriting function of PinPrivacyPreferenceController

Test: None
Bug: b/292569343
Change-Id: Idbfa244921957be2bba3cd02e5e873e81e8807d8
Merged-In: Idbfa244921957be2bba3cd02e5e873e81e8807d8
(cherry picked from commit a7d7eb9a16)
(cherry picked from commit 4ca80e6013)

src/com/android/settings/security/screenlock/PinPrivacyPreferenceController.kt

@@ -45,7 +45,7 @@ class PinPrivacyPreferenceController(
         return PREF_KEY
     }
 
-    override fun onPreferenceChange(preference: Preference?, value: Any?): Boolean {
+    override fun onPreferenceChange(preference: Preference, value: Any): Boolean {
         lockPatternUtils.setPinEnhancedPrivacyEnabled((value as Boolean), userId)
         return true
     }