Correct line spacing in IMAP/POP3 conf files

install/deb/dovecot/conf.d/20-imap.conf

@@ -14,7 +14,7 @@ protocol imap {
 
   # Space separated list of plugins to load (default is global mail_plugins).
   #mail_plugins = $mail_plugins
-mail_plugins = quota imap_quota
+  mail_plugins = quota imap_quota
 
   # IMAP logout format string:
   #  %i - total number of bytes read from client

install/deb/dovecot/conf.d/20-pop3.conf

@@ -78,7 +78,7 @@ protocol pop3 {
 
   # Space separated list of plugins to load (default is global mail_plugins).
   #mail_plugins = $mail_plugins
-mail_plugins = quota
+  mail_plugins = quota
 
   # Workarounds for various client bugs:
   #   outlook-no-nuls: