### 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
tk = _get_token();
							}
							if (!fixed_array_size) {
								array_size = 0;
							}
							if (tk.type != TK_SEMICOLON && tk.type != TK_COMMA) {
								_set_expected_error(",", ";");
								return ERR_PARSE_ERROR;
							}
							st_node->members.push_back(member);
							member_count++;
						} while (tk.type == TK_COMMA); 
					}
				}
				if (member_count == 0) {
					_set_error(RTR("Empty structs are not allowed."));
					return ERR_PARSE_ERROR;
				}
#ifdef DEBUG_ENABLED
				keyword_completion_context = CF_UNSPECIFIED;
#endif 
				tk = _get_token();
				if (tk.type != TK_SEMICOLON) {
					_set_expected_error(";");
					return ERR_PARSE_ERROR;
				}
#ifdef DEBUG_ENABLED
				keyword_completion_context = CF_GLOBAL_SPACE;
#endif 
				shader->structs[st.name] = st;