### 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)

HBoxContainer *add_menu_hb = memnew(HBoxContainer);
	add_child(add_menu_hb);
	add_menu_hb->add_child(memnew(Label(TTR("Name:"))));
	variable_name = memnew(LineEdit);
	variable_name->set_h_size_flags(SIZE_EXPAND_FILL);
	add_menu_hb->add_child(variable_name);
	add_menu_hb->add_child(memnew(Label(TTR("Type:"))));
	variable_type = memnew(OptionButton);
	variable_type->set_h_size_flags(SIZE_EXPAND_FILL);
	add_menu_hb->add_child(variable_type);
	for (int i = 0; i < RS::GLOBAL_VAR_TYPE_MAX; i++) {
		variable_type->add_item(global_var_type_names[i]);
	}
	variable_add = memnew(Button(TTR("Add")));
	add_menu_hb->add_child(variable_add);
	variable_add->connect("pressed", callable_mp(this, &ShaderGlobalsEditor::_variable_added));
	inspector = memnew(EditorInspector);
	inspector->set_v_size_flags(SIZE_EXPAND_FILL);
	add_child(inspector);
	inspector->set_use_wide_editors(true);
	inspector->set_property_name_style(EditorPropertyNameProcessor::STYLE_RAW);
	inspector->set_use_deletable_properties(true);
	inspector->connect("property_deleted", callable_mp(this, &ShaderGlobalsEditor::_variable_deleted), CONNECT_DEFERRED);
	interface = memnew(ShaderGlobalsEditorInterface);
	interface->connect("var_changed", callable_mp(this, &ShaderGlobalsEditor::_changed));
}
ShaderGlobalsEditor::~ShaderGlobalsEditor() {
	memdelete(interface);
}