### 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
to += struct_name;
									} else {
										to += get_datatype_name(type);
									}
									to += "[";
									to += itos(var.array_size);
									to += "]'";
									_set_error(vformat(RTR("Cannot convert from '%s' to '%s'."), from, to));
									return ERR_PARSE_ERROR;
								}
							}
							bool curly = tk.type == TK_CURLY_BRACKET_OPEN;
							if (unknown_size) {
								if (!curly) {
									_set_expected_error("{");
									return ERR_PARSE_ERROR;
								}
							} else {
								if (full_def) {
									if (curly) {
										_set_expected_error("(");
										return ERR_PARSE_ERROR;
									}
								}
							}
							if (tk.type == TK_PARENTHESIS_OPEN || curly) { 
								while (true) {
									Node *n = _parse_and_reduce_expression(p_block, p_function_info);
									if (!n) {
										return ERR_PARSE_ERROR;