Add new SOGoMailHideInlineAttachments option to sogo.conf

SOGoMailHideInlineAttachments = YES; will allow to hide inline (body and footer) images being shown as attachments.

data/conf/sogo/sogo.conf

@@ -12,6 +12,7 @@
     SOGoJunkFolderName= "Junk";
     SOGoMailDomain = "sogo.local";
     SOGoEnableEMailAlarms = YES;
+    SOGoMailHideInlineAttachments = YES;
     SOGoFoldersSendEMailNotifications = YES;
     SOGoForwardEnabled = YES;