### 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)

p_type == TK_TYPE_ISAMPLER2DARRAY ||
			p_type == TK_TYPE_USAMPLER2DARRAY ||
			p_type == TK_TYPE_SAMPLER3D ||
			p_type == TK_TYPE_ISAMPLER3D ||
			p_type == TK_TYPE_USAMPLER3D ||
			p_type == TK_TYPE_SAMPLERCUBE ||
			p_type == TK_TYPE_SAMPLERCUBEARRAY);
}
ShaderLanguage::DataType ShaderLanguage::get_token_datatype(TokenType p_type) {
	return DataType(p_type - TK_TYPE_VOID);
}
bool ShaderLanguage::is_token_interpolation(TokenType p_type) {
	return (
			p_type == TK_INTERPOLATION_FLAT ||
			p_type == TK_INTERPOLATION_SMOOTH);
}
ShaderLanguage::DataInterpolation ShaderLanguage::get_token_interpolation(TokenType p_type) {
	if (p_type == TK_INTERPOLATION_FLAT) {
		return INTERPOLATION_FLAT;
	} else {
		return INTERPOLATION_SMOOTH;
	}
}
bool ShaderLanguage::is_token_precision(TokenType p_type) {
	return (
			p_type == TK_PRECISION_LOW ||
			p_type == TK_PRECISION_MID ||
			p_type == TK_PRECISION_HIGH);
}
bool ShaderLanguage::is_token_arg_qual(TokenType p_type) {