### 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
if (keyword_completion_context & precision_flag) {
					keyword_completion_context ^= precision_flag;
				}
#endif 
			}
#ifdef DEBUG_ENABLED
			if (is_const && _lookup_next(next)) {
				if (is_token_precision(next.type)) {
					keyword_completion_context = CF_UNSPECIFIED;
				}
				if (is_token_datatype(next.type)) {
					keyword_completion_context ^= CF_DATATYPE;
				}
			}
#endif 
			if (precision != PRECISION_DEFAULT) {
				if (!is_token_nonvoid_datatype(tk.type)) {
					_set_error(RTR("Expected variable type after precision modifier."));
					return ERR_PARSE_ERROR;
				}
			}
			if (!is_struct) {
				if (!is_token_variable_datatype(tk.type)) {
					_set_error(RTR("Invalid variable type (samplers are not allowed)."));
					return ERR_PARSE_ERROR;
				}
			}
			DataType type = is_struct ? TYPE_STRUCT : get_token_datatype(tk.type);
			if (precision != PRECISION_DEFAULT && _validate_precision(type, precision) != OK) {
				return ERR_PARSE_ERROR;