Fix truncated Directory when selecting

[Pheubel]

Resolves #175

Removed get_base_dir() call to prevent the current selected directory from being truncated from the path for the project.

Explanation

(taken from #175 (comment))

Looking into it, this bit of code seems to be causing the issue:

func _update_project_dir() -> void:
	var new_name: String = _project_name_edit.text
	if not _set_custom_folder:
		var base_dir := _project_path_line_edit.text.get_base_dir()  <- this line
		if not _create_folder_check.button_pressed:
			_project_path_line_edit.text = base_dir
		else:
			_project_path_line_edit.text = base_dir.path_join(_format_dir_name(new_name))
	_validate()

what happens is that earlier _project_path_line_edit.text gets set to base/current. for example User/Documents/Godot Projects. when var base_dir := _project_path_line_edit.text.get_base_dir() happens, it strips the end of the path to no longer point to the current selected directory, but instead the one above. so with the previous example, it would turn into User/Documents.

[Pheubel]

This does raise the question if there are any other places where the handling of the selected directory is running into issues.