[simple-scan] Revert "Allow Brother DS-720D to switch back to single side."

[Bartosz <bkosiorek src gnome org>]

commit 1700b4ca806c80176023ee57c125b6aedaaf847e
Author: Bartosz Kosiorek <gang65 poczta onet pl>
Date:   Mon Mar 30 08:15:26 2020 +0200

    Revert "Allow Brother DS-720D to switch back to single side."
    
    This reverts commit 8daf8d18e08be2c80237c35cad9ac67eef9b469b.
    
    The algorithm for setting up ADF single set is follows:
    1. Set single page (eg. "ADF Duplex", "Duplex ADF")
    2. If setting Single page is failed, then set generic ADF
       (eg. ""Automatic Document Feeder", "ADF" etc.)
    
    It means that this patch is no needed, as it is should
    work without it.

 src/scanner.vala | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/src/scanner.vala b/src/scanner.vala
index 40be91d..75474af 100644
--- a/src/scanner.vala
+++ b/src/scanner.vala
@@ -948,8 +948,7 @@ public class Scanner : Object
                 string[] adf_front_sources =
                 {
                     "ADF Front",
-                    Sane.I18N ("ADF Front"),
-                    "ADF"
+                    Sane.I18N ("ADF Front")
                 };
 
                 string[] adf_back_sources =