Catch exceptions from setLockCredential()

When LockPatternUtils#setLockCredential() fails, it can either return
false or throw an exception.  Catch the exception and treat it the same
way as a false return value, to prevent crashing com.android.settings.

Bug: 253043065
Test: Tried setting lockscreen credential while in secure FRP mode using
      smartlock setup activity launched by intent via adb.  Verified
      that com.android.settings no longer crashes due to the exception
      from LockPatternUtils#setLockCredential().
Change-Id: I48b9119c19fb6378b1f88d36433ee4f4c8501d76

src/com/android/settings/password/SaveAndFinishWorker.java

@@ -107,9 +107,14 @@ public class SaveAndFinishWorker extends Fragment {
     @VisibleForTesting
     Pair<Boolean, Intent> saveAndVerifyInBackground() {
         final int userId = mUserId;
+        try {
             if (!mUtils.setLockCredential(mChosenCredential, mCurrentCredential, userId)) {
                 return Pair.create(false, null);
             }
+        } catch (RuntimeException e) {
+            Log.e(TAG, "Failed to set lockscreen credential", e);
+            return Pair.create(false, null);
+        }
 
         unifyProfileCredentialIfRequested();