--convert-3to4 messes up thread arguments

[and3rson]

Godot version

4.0-alpha12

System information

ArchLinux

Issue description

# Before --convert-3to4:
thread.start(self, "_load_scene", [map_filename, target_spawn])

# After:
thread.start(self,Callable("_load_scene",[map_filename),target_spawn])

# Expected output:
thread.start(Callable(self, "_load_scene").bind(map_filename, target_spawn))

Steps to reproduce

1. Create a project in Godot 3.x which uses Thread.new().start with bound parameters
2. Run Godot 4.x with --convert-3to4
3. Observe incorrect Callable syntax

Minimal reproduction project

No response

[Calinou]

cc @qarmin