Fix misplaced bracket

formulas/foreman/configure.sls

@@ -128,6 +128,6 @@ foreman-installer:
 {%- if pillar['foreman_tftp'] is defined %}
             --foreman-proxy-tftp true
             --foreman-proxy-tftp-managed true
-            --foreman-proxy-tftp-servername {{ grains['ip4_interfaces'][pillar['foreman_provisioning_interface'][0]] }}
+            --foreman-proxy-tftp-servername {{ grains['ip4_interfaces'][pillar['foreman_provisioning_interface']][0] }}
 {%- endif %}