[Fabric-Sync] Fix subscription for non-ICD devices (#36799)

examples/fabric-sync/admin/DeviceSynchronization.cpp

diff --git a/examples/fabric-sync/admin/DeviceSynchronization.cpp b/examples/fabric-sync/admin/DeviceSynchronization.cpp
index 527ccfa..fea8078 100644
--- a/examples/fabric-sync/admin/DeviceSynchronization.cpp
+++ b/examples/fabric-sync/admin/DeviceSynchronization.cpp
@@ -274,7 +274,7 @@
     bridge::FabricBridge::Instance().AddSynchronizedDevice(mCurrentDeviceData);
 
     // TODO(#35077) Figure out how we should reflect CADMIN values of ICD.
-    if (!mCurrentDeviceData.isIcd)
+    if (!mCurrentDeviceData.isIcd.value_or(false))
     {
         VerifyOrDie(mController);
         ScopedNodeId scopedNodeId(mNodeId, mController->GetFabricIndex());