Fix allowemailregister config typo and default should be true

Author: jackycute

lib/config.js

@@ -132,7 +132,7 @@ if (process.env.HMD_LDAP_PROVIDERNAME) {
 }
 var imgur = process.env.HMD_IMGUR_CLIENTID || config.imgur || false;
 var email = process.env.HMD_EMAIL ? (process.env.HMD_EMAIL === 'true') : !!config.email;
-var allowemailregister = process.env.HMD_ALLOW_EMAIL_REGISTER ? (process.env.HMD_HMD_ALLOW_EMAIL_REGISTER === 'true') : !!config.allowemailregister;
+var allowemailregister = process.env.HMD_ALLOW_EMAIL_REGISTER ? (process.env.HMD_ALLOW_EMAIL_REGISTER === 'true') : ((typeof config.allowemailregister === 'boolean') ? config.allowemailregister : true);
 
 function getserverurl() {
     var url = '';