datasets: adapt to compress.gzip.decompress single-arg API

compress.gzip.decompress() dropped its DecompressParams argument
(vlang/v#27320); validation is now always performed by the deflate
backend. Update the loader call accordingly.

Author: medvednikov

datasets/loader.v

@@ -83,11 +83,7 @@ fn download_dataset(data DatasetDownload) !string {
 			}
 		} else {
 			file_content := os.read_file(target)!
-			content := gzip.decompress(file_content.bytes(),
-				verify_header_checksum: true
-				verify_length:          false
-				verify_checksum:        false
-			)!
+			content := gzip.decompress(file_content.bytes())!
 			os.write_file(uncompressed_path, content.bytestr())!
 		}
 	}