### 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)

}
							MemberNode *member = alloc_node<MemberNode>();
							member->precision = precision;
							member->datatype = type;
							member->struct_name = struct_name;
							member->name = tk.text;
							member->array_size = array_size;
							if (member_names.has(member->name)) {
								_set_redefinition_error(String(member->name));
								return ERR_PARSE_ERROR;
							}
							member_names.insert(member->name);
							tk = _get_token();
							if (tk.type == TK_BRACKET_OPEN) {
								Error error = _parse_array_size(nullptr, constants, true, nullptr, &member->array_size, nullptr);
								if (error != OK) {
									return error;
								}
								tk = _get_token();
							}
							if (!fixed_array_size) {
								array_size = 0;
							}
							if (tk.type != TK_SEMICOLON && tk.type != TK_COMMA) {
								_set_expected_error(",", ";");
								return ERR_PARSE_ERROR;
							}
							st_node->members.push_back(member);
							member_count++;
						} while (tk.type == TK_COMMA);