Remove port from Browsersync's proxy option

Port 8080 has been added in understrap#955. Explicitly providing a port prevents Browsersync to auto-detect the port.

Author: IanDelMar

gulpconfig.json

@@ -1,6 +1,6 @@
 {
 	"browserSyncOptions": {
-		"proxy": "localhost:8080/",
+		"proxy": "localhost/",
 		"notify": false,
 		"files": ["./css/*.min.css", "./js/*.min.js", "./**/*.php"]
 	},