fix: mpv in verify_sync

sync_audio_test.py

@@ -413,10 +413,7 @@ class SyncWindow(QtWidgets.QMainWindow):
         cmd = [sys.executable, script, "--config", "config.toml",
                "--lag", f"{self.lag_sec:.6f}", "--mode", "short"]
         print(f"Launching: {' '.join(cmd)}")
-        env = os.environ.copy()
-        env["LC_NUMERIC"] = "C"
-        env["QT_QPA_PLATFORM"] = "xcb"
-        subprocess.Popen(cmd, cwd=os.path.dirname(os.path.abspath(__file__)), env=env)
+        subprocess.Popen(cmd, cwd=os.path.dirname(os.path.abspath(__file__)))
 
     def on_apply_sync(self):
         """Run apply_sync.py on full files, then launch verify_sync.py in full mode."""
@@ -438,10 +435,7 @@ class SyncWindow(QtWidgets.QMainWindow):
         cmd2 = [sys.executable, verify_script, "--config", "config.toml",
                 "--lag", f"{self.lag_sec:.6f}", "--mode", "full"]
         print(f"Launching: {' '.join(cmd2)}")
-        env2 = os.environ.copy()
-        env2["LC_NUMERIC"] = "C"
-        env2["QT_QPA_PLATFORM"] = "xcb"
-        subprocess.Popen(cmd2, cwd=script_dir, env=env2)
+        subprocess.Popen(cmd2, cwd=script_dir)
 
     def play(self, which: str):
         if not HAS_SD: