### 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
return 16;
		case TYPE_ISAMPLER2D:
			return 16;
		case TYPE_USAMPLER2D:
			return 16;
		case TYPE_SAMPLER2DARRAY:
			return 16;
		case TYPE_ISAMPLER2DARRAY:
			return 16;
		case TYPE_USAMPLER2DARRAY:
			return 16;
		case TYPE_SAMPLER3D:
			return 16;
		case TYPE_ISAMPLER3D:
			return 16;
		case TYPE_USAMPLER3D:
			return 16;
		case TYPE_SAMPLERCUBE:
			return 16;
		case TYPE_SAMPLERCUBEARRAY:
			return 16;
		case TYPE_STRUCT:
			return 0;
		case TYPE_MAX: {
			ERR_FAIL_V(0);
		};
	}
	ERR_FAIL_V(0);
}
void ShaderLanguage::get_keyword_list(List<String> *r_keywords) {