Do not use ActiveStorage variants, process original avatar

Variants are currently broken. So we process the original file with the
most common avatar dimensions and stripping metadata, then hash and
upload only that version.

app/services/ldap_manager/update_avatar.rb

@@ -14,15 +14,16 @@ module LdapManager
       end
 
       img_data = @user.avatar.blob.download
-      jpg_data = process(img_data)
+      jpg_data = process_avatar
 
+      Rails.logger.debug { "Storing new jpegPhoto for user #{@user.cn} in LDAP" }
       result = replace_attribute(@dn, :jpegPhoto, jpg_data)
       result == 0
     end
 
     private
 
-    def process(data)
+    def process_avatar
       @user.avatar.blob.open do |file|
         processed = ImageProcessing::Vips
           .source(file)