[simple-scan] Add missing source option from Brother driver

[Bartosz <bkosiorek src gnome org>]

commit 652699567bbf4bdafa632084fe6918e57f5a76e2
Author: Anton Mayer <p32 tuta io>
Date:   Sat Sep 25 08:54:27 2021 +0200

    Add missing source option from Brother driver

 src/scanner.vala | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/scanner.vala b/src/scanner.vala
index 01e77e2f..cc7e9727 100644
--- a/src/scanner.vala
+++ b/src/scanner.vala
@@ -926,6 +926,7 @@ public class Scanner : Object
             Sane.I18N ("Automatic Document Feeder"),
             "ADF",
             "Automatic Document Feeder(centrally aligned)", /* Seen in the proprietary brother3 driver */
+            "Automatic Document Feeder(center aligned)", /* Seen in Brother's proprietary brscan5 driver */
             "Automatic Document Feeder(left aligned)", /* Seen in the proprietary brother3 driver */
             "ADF Simplex" /* Samsung unified driver. LP: # 892915 */
         };