### 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
case 'r':
								case 'g':
								case 'b':
								case 'a':
									if (position_symbols.size() > 0 || texture_symbols.size() > 0) {
										mix_error = true;
										break;
									}
									if (!color_symbols.has(c[i])) {
										color_symbols.insert(c[i]);
									} else {
										repeated = true;
									}
									break;
								case 'x':
								case 'y':
								case 'z':
								case 'w':
									if (color_symbols.size() > 0 || texture_symbols.size() > 0) {
										mix_error = true;
										break;
									}
									if (!position_symbols.has(c[i])) {
										position_symbols.insert(c[i]);
									} else {
										repeated = true;
									}
									break;
								case 's':
								case 't':