### 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)

_set_error(RTR("Invalid constant type (samplers are not allowed)."));
						} else {
							_set_error(RTR("Invalid function type (samplers are not allowed)."));
						}
						return ERR_PARSE_ERROR;
					}
				}
				if (is_struct) {
					type = TYPE_STRUCT;
				} else {
					type = get_token_datatype(tk.type);
				}
				if (precision != PRECISION_DEFAULT && _validate_precision(type, precision) != OK) {
					return ERR_PARSE_ERROR;
				}
				prev_pos = _get_tkpos();
				tk = _get_token();
#ifdef DEBUG_ENABLED
				keyword_completion_context = CF_UNSPECIFIED;
#endif 
				bool unknown_size = false;
				bool fixed_array_size = false;
				if (tk.type == TK_BRACKET_OPEN) {
					Error error = _parse_array_size(nullptr, constants, !is_constant, nullptr, &array_size, &unknown_size);
					if (error != OK) {
						return error;
					}
					fixed_array_size = true;
					prev_pos = _get_tkpos();
				}