fixing bug in restrict_ip.services.yml that affects PHP 7.x

restrict_ip.services.yml

@@ -5,12 +5,12 @@ parameters:
 
 services:
   restrict_ip.mapper:
-    class: %restrict_ip.mapper.class%
+    class: '%restrict_ip.mapper.class%'
     arguments:
       - @database
 
   restrict_ip.service:
-    class: %restrict_ip.service.class%
+    class: '%restrict_ip.service.class%'
     arguments:
       - @current_user
       - @path.current
@@ -19,7 +19,7 @@ services:
       - @restrict_ip.mapper
 
   restrict_ip.event_subscriber:
-    class: %restrict_ip.event_subscriber.class%
+    class: '%restrict_ip.event_subscriber.class%'
     arguments:
       - @restrict_ip.service
       - @config.factory