crowd service: fix secure sso cookies

Crowd didn't detect a secure connection before.

nixos/modules/services/web-apps/atlassian/crowd.nix

@@ -137,7 +137,7 @@ in
 
         sed -e 's,port="8095",port="${toString cfg.listenPort}" address="${cfg.listenAddress}",' \
         '' + (lib.optionalString cfg.proxy.enable ''
-          -e 's,compression="on",compression="off" protocol="HTTP/1.1" proxyName="${cfg.proxy.name}" proxyPort="${toString cfg.proxy.port}" scheme="${cfg.proxy.scheme}" secure="${toString cfg.proxy.secure}",' \
+          -e 's,compression="on",compression="off" protocol="HTTP/1.1" proxyName="${cfg.proxy.name}" proxyPort="${toString cfg.proxy.port}" scheme="${cfg.proxy.scheme}" secure="${if cfg.proxy.secure then "true" else "false"}",' \
         '') + ''
           ${pkg}/apache-tomcat/conf/server.xml.dist > ${cfg.home}/server.xml
       '';