### Godot version

4.0.beta14

### System information

windows 10, gles 3, nvidia graphics

### Issue description

SCREEN_TEXTURE  was dropped in beta 14. The suggested replacement is to use ```uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmaps;```, but filter_linear_mipmaps is not recognized as a valid shader type hint and a shader using it fails to compile.

### Steps to reproduce

Create a canvas item shader and use the filter_linear_mipmaps type hint with a sampler2D uniform.

### Minimal reproduction project

N/A
HashSet<String> kws;
	int idx = 0;
	while (keyword_list[idx].text) {
		kws.insert(keyword_list[idx].text);
		idx++;
	}
	idx = 0;
	while (builtin_func_defs[idx].name) {
		kws.insert(builtin_func_defs[idx].name);
		idx++;
	}
	for (const String &E : kws) {
		r_keywords->push_back(E);
	}
}
bool ShaderLanguage::is_control_flow_keyword(String p_keyword) {
	return p_keyword == "break" ||
			p_keyword == "case" ||
			p_keyword == "continue" ||
			p_keyword == "default" ||
			p_keyword == "do" ||
			p_keyword == "else" ||
			p_keyword == "for" ||
			p_keyword == "if" ||
			p_keyword == "return" ||
			p_keyword == "switch" ||
			p_keyword == "while";
}
void ShaderLanguage::get_builtin_funcs(List<String> *r_keywords) {