### 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
break; 
					} else {
						_set_error(vformat(RTR("Unexpected token: '%s'."), get_token_text(tk)));
						return ERR_PARSE_ERROR;
					}
				}
			} break;
			case TK_STRUCT: {
				ShaderNode::Struct st;
				DataType type;
#ifdef DEBUG_ENABLED
				keyword_completion_context = CF_UNSPECIFIED;
#endif 
				tk = _get_token();
				if (tk.type == TK_IDENTIFIER) {
					st.name = tk.text;
					if (shader->constants.has(st.name) || shader->structs.has(st.name)) {
						_set_redefinition_error(String(st.name));
						return ERR_PARSE_ERROR;
					}
					tk = _get_token();
					if (tk.type != TK_CURLY_BRACKET_OPEN) {
						_set_expected_error("{");
						return ERR_PARSE_ERROR;
					}
				} else {
					_set_error(RTR("Expected a struct identifier."));
					return ERR_PARSE_ERROR;
				}
				StructNode *st_node = alloc_node<StructNode>();