genesys: Add buttons to LiDE 60

Canon LiDE 60 has four buttons. These are already supported in the
GL841, we just needed to add them to the config. Tested it with scanbd.

backend/genesys_devices.c

@@ -2308,7 +2308,10 @@ static Genesys_Model canon_lide_60_model = {
     | GENESYS_FLAG_CUSTOM_GAMMA
     | GENESYS_FLAG_HALF_CCD_MODE,
 
-  GENESYS_HAS_NO_BUTTONS, /* no buttons supported */
+  GENESYS_HAS_COPY_SW             /* Has four buttons: COPY, SCAN, PDF, EMAIL */
+    | GENESYS_HAS_SCAN_SW
+    | GENESYS_HAS_FILE_SW
+    | GENESYS_HAS_EMAIL_SW,
   300,
   400
 };                                /* this is completely untested -- hmg */