fix: protocol URL not starting download in some cases

Due to the protocol already containing `://`, some browsers will strip the `:` from the `https://` protocol, causing the URL to not be recognized, meaning the download never starts.

Author: Bentroen

scripts/control_create/control_create.gml

@@ -704,6 +704,9 @@ function control_create() {
 	// Download song
 	if (protocol_data != pointer_null) {
 		var download_url = string_replace(protocol_data, "nbs://", "")
+		download_url = string_replace(download_url, "https//", "https://") // Re-add : stripped from URL
+		download_url = string_replace(download_url, "http//", "http://")
+		download_song_start(download_url)
 	}
 	// Open song
 	else if (filename != "") {

scripts/control_http/control_http.gml

@@ -2,7 +2,7 @@ function control_http() {
 	// control_http()
 	// Handles the check for updates, then attempts to download it if one is available
 
-	if (song_download_data != -1) {
+	if (song_download_data != pointer_null) {
 		download_song_from_url()
 	}