### 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)

decl.initializer.push_back(n);
							}
							tk = _get_token();
						} else {
							if (tk.type != TK_CURLY_BRACKET_OPEN) {
								if (unknown_size) {
									_set_expected_error("{");
									return ERR_PARSE_ERROR;
								}
								full_def = true;
								DataPrecision precision2 = PRECISION_DEFAULT;
								if (is_token_precision(tk.type)) {
									precision2 = get_token_precision(tk.type);
									tk = _get_token();
									if (!is_token_nonvoid_datatype(tk.type)) {
										_set_error(RTR("Expected data type after precision modifier."));
										return ERR_PARSE_ERROR;
									}
								}
								DataType type2;
								StringName struct_name2 = "";
								if (shader->structs.has(tk.text)) {
									type2 = TYPE_STRUCT;
									struct_name2 = tk.text;
								} else {
									if (!is_token_variable_datatype(tk.type)) {
										_set_error(RTR("Invalid data type for the array."));
										return ERR_PARSE_ERROR;
									}
									type2 = get_token_datatype(tk.type);