### 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
StringName func_name = parent_function->name;
						if (!used_local_vars.has(func_name)) {
							used_local_vars.insert(func_name, HashMap<StringName, Usage>());
						}
						used_local_vars[func_name].insert(name, Usage(tk_line));
					}
				}
#endif 
				BlockNode::Variable var;
				var.type = type;
				var.precision = precision;
				var.line = tk_line;
				var.array_size = array_size;
				var.is_const = is_const;
				var.struct_name = struct_name;
				tk = _get_token();
				if (tk.type == TK_BRACKET_OPEN) {
					Error error = _parse_array_size(p_block, p_function_info, false, &decl.size_expression, &var.array_size, &unknown_size);
					if (error != OK) {
						return error;
					}
					decl.size = var.array_size;
					array_size = var.array_size;
					tk = _get_token();
				}
#ifdef DEBUG_ENABLED
				if (var.type == DataType::TYPE_BOOL) {
					keyword_completion_context = CF_BOOLEAN;
				}
#endif