Remove the accolade around interfacename (#126)

The powershell commands places an accolade around
the name of the interfaces, this causes an apply
on the resource windowsfirewall with the parameter
disabled_interface_aliases every run. This will
fix it.

lib/puppet/provider/windowsfirewall/powershell.rb

@@ -92,7 +92,7 @@ def self.get_firewall_properties(zone)
         property_name = method_map.key(key.strip)
         next if property_name.nil?
 
-        hash_of_properties[property_name.intern] = val.strip.chomp
+        hash_of_properties[property_name.intern] = val.strip.chomp.delete('{|}')
       end
       hash_of_properties[:name]     = zone
       hash_of_properties[:ensure]   = hash_of_properties[:ensure] == 'True' ? :present : :absent