Pass the feature flag instead of false to RegisterAPIService

Doh. The feature flag was not actually being used to enable the new DS
config CRUD APIs. This PR fixes that, hashtag facepalm.

pkg/registry/apis/datasource/register.go

@@ -85,7 +85,8 @@ func RegisterAPIService(
 			accessControl,
 			//nolint:staticcheck // not yet migrated to OpenFeature
 			features.IsEnabledGlobally(featuremgmt.FlagDatasourceQueryTypes),
-			false,
+			//nolint:staticcheck // not yet migrated to OpenFeature
+			features.IsEnabledGlobally(featuremgmt.FlagQueryServiceWithConnections),
 		)
 		if err != nil {
 			return nil, err