Add placeholder for Rspamd controller password written via UI

data/conf/rspamd/override.d/worker-controller-password.inc

@@ -0,0 +1 @@
+enable_password = "$2$hd67jioinjy4nu6t65tsrb7srexeemp5$tjgnnj3az1gfiqi1tkat7kh8qyoi4gpd5hemkm48k9fmzyf8ypwb";