### 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
if (constant.array_size > 0 || unknown_size) {
								_set_error(RTR("Expected array initialization."));
								return ERR_PARSE_ERROR;
							} else {
								_set_error(RTR("Expected initialization of constant."));
								return ERR_PARSE_ERROR;
							}
						}
						shader->constants[name] = constant;
						shader->vconstants.push_back(constant);
#ifdef DEBUG_ENABLED
						if (check_warnings && HAS_WARNING(ShaderWarning::UNUSED_CONSTANT_FLAG)) {
							used_constants.insert(name, Usage(tk_line));
						}
#endif 
						if (tk.type == TK_COMMA) {
							tk = _get_token();
							if (tk.type != TK_IDENTIFIER) {
								_set_error(RTR("Expected an identifier after type."));
								return ERR_PARSE_ERROR;
							}
							name = tk.text;
							if (_find_identifier(nullptr, false, constants, name)) {
								_set_redefinition_error(String(name));
								return ERR_PARSE_ERROR;
							}
							if (has_builtin(p_functions, name)) {
								_set_redefinition_error(String(name));
								return ERR_PARSE_ERROR;
							}