vpm: make the 404 in text error more precise (till https://vpm.vlang.io/ is fixed properly)

cmd/tools/vpm.v

@@ -545,7 +545,7 @@ fn get_module_meta_info(name string) ?Mod {
 			errors << 'Error details: $err'
 			continue
 		}
-		if r.status_code == 404 {
+		if r.status_code == 404 || r.text.trim_space() == '404' {
 			errors << 'Skipping module "$name", since $server_url reported that "$name" does not exist.'
 			continue
 		}