### 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)

}
						tk = _get_token();
					}
					if (tk.type != TK_IDENTIFIER) {
						_set_error(RTR("Expected an identifier for argument name."));
						return ERR_PARSE_ERROR;
					}
					param_name = tk.text;
					ShaderLanguage::IdentifierType itype;
					if (_find_identifier(func_node->body, false, builtins, param_name, (ShaderLanguage::DataType *)nullptr, &itype)) {
						if (itype != IDENTIFIER_FUNCTION) {
							_set_redefinition_error(String(param_name));
							return ERR_PARSE_ERROR;
						}
					}
					if (has_builtin(p_functions, param_name)) {
						_set_redefinition_error(String(param_name));
						return ERR_PARSE_ERROR;
					}
					FunctionNode::Argument arg;
					arg.type = param_type;
					arg.name = param_name;
					arg.type_str = param_struct_name;
					arg.precision = param_precision;
					arg.qualifier = param_qualifier;
					arg.tex_argument_check = false;
					arg.tex_builtin_check = false;
					arg.tex_argument_filter = FILTER_DEFAULT;
					arg.tex_argument_repeat = REPEAT_DEFAULT;
					arg.is_const = param_is_const;