### Godot version

v4.1.dev.custom_build.a7276f1ce

### System information

Win10, AMD 2600, GeForce GTX 1060, Vulkan API 1.3.205

### Issue description

I can't get correct color data from an array of source_color type.
The color data is saved as **Color** in the file:
`shader_parameter/palette = [Color (1, 0, 0, 1), Color (0, 1, 0, 1), Color (0, 0, 1, 1)]`
Shouldn't it be saved as PackedColorArray?


### Steps to reproduce

1.Declare an array of source_color type.
2.Set colors.

### Minimal reproduction project

[shadertest.zip](https://github.com/godotengine/godot/files/11246504/shadertest.zip)

Shader *shader = shader_owner.get_or_null(p_shader);
	ERR_FAIL_COND_V(!shader, RID());
	if (shader->default_texture_parameter.has(p_name) && shader->default_texture_parameter[p_name].has(p_index)) {
		return shader->default_texture_parameter[p_name][p_index];
	}
	return RID();
}
Variant MaterialStorage::shader_get_parameter_default(RID p_shader, const StringName &p_param) const {
	Shader *shader = shader_owner.get_or_null(p_shader);
	ERR_FAIL_COND_V(!shader, Variant());
	if (shader->data) {
		return shader->data->get_default_parameter(p_param);
	}
	return Variant();
}
void MaterialStorage::shader_set_data_request_function(ShaderType p_shader_type, ShaderDataRequestFunction p_function) {