Guard user disabled slicing error behind feature flag

Test: SlicePurchaseControllerTest
Bug: 307378699
Change-Id: Icd897b37d71b51626f8abb7654658398443a64e2
diff --git a/src/com/android/phone/PhoneGlobals.java b/src/com/android/phone/PhoneGlobals.java
index b11431c..4773a83 100644
--- a/src/com/android/phone/PhoneGlobals.java
+++ b/src/com/android/phone/PhoneGlobals.java
@@ -554,7 +554,7 @@
 
             mKeyguardManager = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
 
-            phoneMgr = PhoneInterfaceManager.init(this);
+            phoneMgr = PhoneInterfaceManager.init(this, featureFlags);
 
             imsRcsController = ImsRcsController.init(this);