epson2: Add XP-452 455 Series as supported

Tested via simple-scan with a device branded as XP-455 but which
identifies in the device descriptor's product string as "XP-452 455
Series".

backend/epson2_usb.c

@@ -181,6 +181,7 @@ SANE_Word sanei_epson_usb_product_ids[] = {
   0x1121, /* ET-2650, L495 */
   0x1122, /* ET-2600 Series, ET-2610 Series, L3050 Series, L3060 Series, L395 Series, L396 Series */
   0x113d, /* XP-255 */
+  0x113e, /* XP-452 455 Series */
   0x1141, /* L3100 Series */
   0x1142, /* L3110 Series */
   0	/* last entry - this is used for devices that are specified

doc/descriptions/epson2.desc

@@ -3461,6 +3461,12 @@
 :status     :good
 :comment    "network interface supported via DFSG non-free iscan-network-nt package<br>all-in-one"
 
+:model      "XP-452 455 Series"
+:interface  "USB"
+:usbid      "0x04b8" "0x113e"
+:status     :good
+:comment    "all-in-one"
+
 :model      "XP-600 Series"
 :interface  "USB"
 :usbid      "0x04b8" "0x089e"