fix: potential infinite loop on DialogicResourceUtil.gd

[AleryBerry]

My game was strangely freezing when trying to trigger a timeline. I looked into the codebase and I found out this while loop on DialogicResourceUtil caused the issue.

static func add_resource_to_directory(file_path:String, directory:Dictionary) -> Dictionary:
    var suggested_name := file_path.get_file().trim_suffix("."+file_path.get_extension())
    while suggested_name in directory:
        suggested_name = file_path.trim_suffix("/"+suggested_name+"."+file_path.get_extension()).get_file().path_join(suggested_name)
    directory[suggested_name] = file_path
    return directory

If file_path is user://laura olsdal.dch and directory is { ..., "laura_olsdal": "res://assets/characters/laura_olsdal/laura_olsdal.dch", ... } the code enters an infinite loop. So I just made a little check to break the loop if suggested_name stops changing.

[zaknafean]

I can't recreate this issue. Anyway you can provide a small project that demonstrates it?