dl-linux-tarball.bash: drop wget's "--no-progress" flag

Looks like wget does not support it anymore
$ wget --version
GNU Wget2 2.1.0 - multithreaded metalink/file/website downloader

$ ./benchmark.bash
Testing gocryptfs   at /tmp/benchmark.bash.bmt: gocryptfs v2.4.0-38-g40abf96-dirty; go-fuse v2.5.0; 2024-09-03 go1.21.4 linux/amd64
/tmp/benchmark.bash.bmt.mnt is a mountpoint
Downloading linux-3.0.tar.gz
Unknown option 'show-progress'

tests/dl-linux-tarball.bash

@@ -20,7 +20,7 @@ fi
 if [[ $SIZE_ACTUAL -ne $SIZE_WANT ]]; then
 	echo "Downloading linux-3.0.tar.gz"
 	if command -v wget > /dev/null ; then
-		wget -nv --show-progress -c -O "$TGZ" "$URL"
+		wget -nv -c -O "$TGZ" "$URL"
 	else
 		curl -o "$TGZ" "$URL"
 	fi