fix file url error (#202)

Co-authored-by: Stanley <spesekspesek@gmail.com>

Author: SheepYang1993

src/build/start.ts

@@ -1,7 +1,7 @@
 import path from "node:path";
 import fs from "node:fs/promises";
 import { buildSpessaSynth } from "./build_script.ts";
-import { fileURLToPath } from "node:url";
+import { fileURLToPath, pathToFileURL } from "node:url";
 
 // Don't use meta.dirname: https://github.com/spessasus/SpessaSynth
 const REPO_ROOT = path.resolve(
@@ -27,4 +27,4 @@ if (!(await fileExists(SERVER_FILE))) {
 
 console.info("🖥️ Starting server...");
 // Execute!
-await import(SERVER_FILE);
+await import(pathToFileURL(SERVER_FILE).toString());