### 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
idx++;
			}
		} else if (GETCHAR(0) == '/' && GETCHAR(1) == '*') {
			idx += 2;
			while (true) {
				if (GETCHAR(0) == 0) {
					return 0;
				}
				if (GETCHAR(0) == '*' && GETCHAR(1) == '/') {
					idx += 2;
					break; 
				}
				idx++;
			}
		} else {
			switch (GETCHAR(0)) {
				case ' ':
				case '\t':
				case '\r':
				case '\n': {
					idx++;
				} break; 
				default:
					return idx;
			}
		}
	}
#undef GETCHAR
}
String ShaderLanguage::get_shader_type(const String &p_code) {