ci: rename duplicate example files, to make them unique, and reduce false positives in v build-examples on windows.

examples/vweb/file_transform/vweb_example.v

@@ -1,40 +0,0 @@
-module main
-
-import vweb
-
-const port = 8082
-
-struct App {
-	vweb.Context
-}
-
-fn main() {
-	vweb.run(&App{}, port)
-}
-
-pub fn (mut app App) index() vweb.Result {
-	return $vweb.html()
-}
-
-@['/upload'; post]
-pub fn (mut app App) upload() vweb.Result {
-	fdata := app.files['upfile']
-
-	data_rows := fdata[0].data.split('\n')
-
-	mut output_data := ''
-
-	for elem in data_rows {
-		delim_row := elem.split('\t')
-		output_data += '${delim_row[0]}\t${delim_row[1]}\t${delim_row[0].int() + delim_row[1].int()}\n'
-	}
-
-	output_data = output_data.all_before_last('\n')
-
-	println(output_data)
-
-	app.add_header('Content-Disposition', 'attachment; filename=results.txt')
-	app.send_response_to_client('application/octet-stream', output_data)
-
-	return $vweb.html()
-}