### 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
TkPos pre_pos = _get_tkpos();
	int line = pre_pos.tk_line;
	_get_token();
	Token tk = _get_token();
	_set_tkpos(pre_pos);
	if (tk.line == line) {
		r_tk = tk;
		return true;
	}
	return false;
}
String ShaderLanguage::token_debug(const String &p_code) {
	clear();
	code = p_code;
	String output;
	Token tk = _get_token();
	while (tk.type != TK_EOF && tk.type != TK_ERROR) {
		output += itos(tk_line) + ": " + get_token_text(tk) + "\n";
		tk = _get_token();
	}
	return output;
}
bool ShaderLanguage::is_token_variable_datatype(TokenType p_type) {