### 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)

int i = 0;
	while (builtin_func_out_args[i].name) {
		if (p_name == builtin_func_out_args[i].name) {
			for (int j = 0; j < BuiltinFuncOutArgs::MAX_ARGS; j++) {
				int arg = builtin_func_out_args[i].arguments[j];
				if (arg == p_param) {
					return true;
				}
				if (arg < 0) {
					return false;
				}
			}
		}
		i++;
	}
	return false;
}
#ifdef DEBUG_ENABLED
void ShaderLanguage::_check_warning_accums() {