Improve detection for Brother devices

Since those devices are printers that shouldn't be exposed on the
internet, I don't think that I should link webpages to test those rules
;)

Please find attached a `curl -i $HOSTNAME` of a valid printer.

src/apps.json

@@ -926,6 +926,10 @@
 			"cats": [
 				40
 			],
+			"html": [
+				"(?:<!--|<BR>)Copyright\\(C\\) [\\d-]+ Brother Industries",
+				"<TITLE>\n\\s*BROTHER "
+			],
 			"icon": "Brother.png",
 			"website": "www.brother.com"
 		},