Fix null useIdentityVerification blocking all ops for non-IV apps

When the server omits jwt_required from the params response,
safeBool() returned null, leaving useIdentityVerification unset.
getNextOps() treated null as "not yet known" and returned null
permanently, silently blocking every SDK operation for the session.

Default to false when the field is absent so non-IV apps are
unaffected by the identity verification gating logic.

Made-with: Cursor

Author: nan-li

OneSignalSDK/onesignal/core/src/main/java/com/onesignal/core/internal/backend/impl/ParamsBackendService.kt

@@ -84,7 +84,7 @@ internal class ParamsBackendService(
         return ParamsObject(
             googleProjectNumber = responseJson.safeString("android_sender_id"),
             enterprise = responseJson.safeBool("enterp"),
-            useIdentityVerification = responseJson.safeBool("jwt_required"),
+            useIdentityVerification = responseJson.safeBool("jwt_required") ?: false,
             notificationChannels = responseJson.optJSONArray("chnl_lst"),
             firebaseAnalytics = responseJson.safeBool("fba"),
             restoreTTLFilter = responseJson.safeBool("restore_ttl_filter"),