### 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 (!is_struct) {
				if (!is_token_variable_datatype(tk.type)) {
					_set_error(RTR("Invalid variable type (samplers are not allowed)."));
					return ERR_PARSE_ERROR;
				}
			}
			DataType type = is_struct ? TYPE_STRUCT : get_token_datatype(tk.type);
			if (precision != PRECISION_DEFAULT && _validate_precision(type, precision) != OK) {
				return ERR_PARSE_ERROR;
			}
#ifdef DEBUG_ENABLED
			keyword_completion_context = CF_UNSPECIFIED;
#endif 
			int array_size = 0;
			bool fixed_array_size = false;
			bool first = true;
			VariableDeclarationNode *vdnode = alloc_node<VariableDeclarationNode>();
			vdnode->precision = precision;
			if (is_struct) {
				vdnode->struct_name = struct_name;
				vdnode->datatype = TYPE_STRUCT;
			} else {
				vdnode->datatype = type;
			};
			vdnode->is_const = is_const;
			do {
				bool unknown_size = false;
				VariableDeclarationNode::Declaration decl;
				tk = _get_token();
				if (first) {