Fix BackupSettingsTest (update blacklist)

Added Settings.Secure.CAMERA_LIFT_TRIGGER_ENABLED to the blacklist
as a candidate for backup.

Bug: 37684646
Test: mmma -j40 frameworks/base/core/tests/coretests, then
adb install -r ${ANDROID_PRODUCT_OUT}/data/app/FrameworksCoreTests/FrameworksCoreTests.apk, then
adb shell am instrument -w -e class android.provider.SettingsBackupTest com.android.frameworks.coretests/android.support.test.runner.AndroidJUnitRunner
Change-Id: I51e00062dc570992f391d7a052e6627865f73327
diff --git a/core/tests/coretests/src/android/provider/SettingsBackupTest.java b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
index 2959d76..7933d77 100644
--- a/core/tests/coretests/src/android/provider/SettingsBackupTest.java
+++ b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
@@ -403,6 +403,7 @@
                  Settings.Secure.BACKUP_PROVISIONED,
                  Settings.Secure.BACKUP_TRANSPORT,
                  Settings.Secure.BLUETOOTH_HCI_LOG,
+                 Settings.Secure.CAMERA_LIFT_TRIGGER_ENABLED, // Candidate for backup?
                  Settings.Secure.CARRIER_APPS_HANDLED,
                  Settings.Secure.CMAS_ADDITIONAL_BROADCAST_PKG,
                  Settings.Secure.COMPLETED_CATEGORY_PREFIX,