Enable sync on push feature flag to partially sync when notifications arrive (#3290)

libraries/featureflag/api/src/main/kotlin/io/element/android/libraries/featureflag/api/FeatureFlags.kt

@@ -131,7 +131,7 @@ enum class FeatureFlags(
         key = "feature.syncOnPush",
         title = "Sync on push",
         description = "Subscribe to room sync when a push is received",
-        defaultValue = { false },
+        defaultValue = { true },
         isFinished = false,
     ),
 }