[simple-scan/gnome-3-34] Fix setting source for Epson scanner, where Flatbed is named 'Document Table'

[Robert Ancell <rancell src gnome org>]

commit 884e24aa8357542d5f75c2f56a70e18c4da97838
Author: Bartosz Kosiorek <gang65 poczta onet pl>
Date:   Sat Mar 28 23:19:44 2020 +0100

    Fix setting source for Epson scanner, where Flatbed is named 'Document Table'

 src/scanner.vala | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/scanner.vala b/src/scanner.vala
index e324c23..3809f6e 100644
--- a/src/scanner.vala
+++ b/src/scanner.vala
@@ -909,7 +909,8 @@ public class Scanner : Object
                     Sane.I18N ("Flatbed"),
                     "FlatBed",
                     "Normal",
-                    Sane.I18N ("Normal")
+                    Sane.I18N ("Normal"),
+                    "Document Table" /* Epson scanners, eg. ET-3760 */ 
                 };
 
                 string[] adf_sources =