Fix require_in condition for nginx packages

Related-task: #PROD-24934 (PROD:24934)
Change-Id: I0e8fcc36f322f81a8185c32eb1ed3504025b38d2
diff --git a/nginx/server.sls b/nginx/server.sls
index 763e928..b7896d3 100644
--- a/nginx/server.sls
+++ b/nginx/server.sls
@@ -15,7 +15,7 @@
       #!/bin/sh
       exit 101
   - require_in:
-    - nginx_packages
+    - pkg: nginx_packages
 {%- endif %}
 
 nginx_packages: