Fix an issue that caused the TunnelVision-fix not to be publicly available (#3889)

Task/Issue URL:
https://app.asana.com/0/1207603085593419/1209262365365751/f

## Description

Our TunnelVision exploit fix was not released publicly due to a mistake
that's being addressed here.

Author: diegoreymendez

Core/FeatureFlag.swift

@@ -139,7 +139,7 @@ extension FeatureFlag: FeatureFlagDescribing {
         case .textZoom:
             return .remoteReleasable(.feature(.textZoom))
         case .networkProtectionEnforceRoutes:
-            return .remoteDevelopment(.subfeature(NetworkProtectionSubfeature.enforceRoutes))
+            return .remoteReleasable(.subfeature(NetworkProtectionSubfeature.enforceRoutes))
         case .adAttributionReporting:
             return .remoteReleasable(.feature(.adAttributionReporting))
         case .crashReportOptInStatusResetting: