Convert mail_log plugin settings

Author: sirainen

data/settings.js

@@ -2663,9 +2663,9 @@ fields aren't cached and it's not a strict requirement to log them.`
 
 	mail_log_events: {
 		plugin: 'mail-log',
-		values: setting_types.STRING,
+		values: setting_types.BOOLLIST,
 		text: `
-A space-separated list of events to log.
+List of events to log.
 
 Available events:
 
@@ -2682,9 +2682,9 @@ Available events:
 
 	mail_log_fields: {
 		plugin: 'mail-log',
-		values: setting_types.STRING,
+		values: setting_types.BOOLLIST,
 		text: `
-A space-separated list of fields to log.
+List of fields to log.
 
 | Field | Restrictions |
 | ----- | ------------ |

docs/core/plugins/mail_log.md

@@ -42,9 +42,7 @@ mail_plugins {
   mail_log = yes
 }
 
-plugin {
-  mail_log_events = delete undelete expunge mailbox_delete mailbox_rename
-  mail_log_fields = uid box msgid size from
-  mail_log_cached_only = yes
-}
+mail_log_events = delete undelete expunge mailbox_delete mailbox_rename
+mail_log_fields = uid box msgid size from
+mail_log_cached_only = yes
 ```