### 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)

if (type == TYPE_VOID || is_sampler_type(type)) {
							_set_error(vformat(RTR("A '%s' data type is not allowed here."), get_datatype_name(type)));
							return ERR_PARSE_ERROR;
						}
#ifdef DEBUG_ENABLED
						keyword_completion_context = CF_UNSPECIFIED;
#endif 
						bool first = true;
						bool fixed_array_size = false;
						int array_size = 0;
						do {
							tk = _get_token();
							if (first) {
								first = false;
								if (tk.type != TK_IDENTIFIER && tk.type != TK_BRACKET_OPEN) {
									_set_error(RTR("Expected an identifier or '['."));
									return ERR_PARSE_ERROR;
								}
								if (tk.type == TK_BRACKET_OPEN) {
									Error error = _parse_array_size(nullptr, constants, true, nullptr, &array_size, nullptr);
									if (error != OK) {
										return error;
									}
									fixed_array_size = true;
									tk = _get_token();
								}
							}
							if (tk.type != TK_IDENTIFIER) {
								_set_error(RTR("Expected an identifier."));
								return ERR_PARSE_ERROR;