dsa-check-running-kernel: fix a new apparent breakage

since a while we are seeing this with the backports kernel:
% dsa-check-running-kernel                                                                                                                  :(
dpkg: warning: version '1.linux-image-5.3.0-0.bpo.2-amd64(=5.3.9-2~bpo10+1)' has bad syntax: invalid character in version number
dpkg: warning: version '1.linux-image-5.3.0-0.bpo.2-amd64(=5.3.9-2~bpo10+1)' has bad syntax: invalid character in version number
WARNING: Kernel needs upgrade [linux-image-5.3.0-0.bpo.2-amd64(=5.3.9-2~bpo10+1) != linux-image-5.3.0-0.bpo.2-amd64]

likely due to the unversioned package now having versioned dependencies,
which is a new thing.

Signed-off-by: Mattia Rizzolo <mattia@debian.org>

hosts/common/usr/local/bin/dsa-check-running-kernel

@@ -94,7 +94,7 @@ get_avail() {
 
 	local imagename=0
 	# --no-all-versions show shows only the candidate
-	for vers in $(apt-cache --no-all-versions show ${prefix}-image-${metavers} | sed -n 's/^Depends: //p' | tr ',' '\n' | tr -d ' ' | grep ${prefix}-image | awk '{print $1}' | awk -F"|" '{print $1}' | sort -Vu); do
+	for vers in $(apt-cache --no-all-versions show ${prefix}-image-${metavers} | sed -n 's/^Depends: //p' | tr ',' '\n' | awk '{print $1}' | grep ${prefix}-image | awk -F"|" '{print $1}' | sort -Vu); do
 		if dpkg --compare-versions "1.$vers" gt "1.$imagename"; then
 			imagename=$vers
 		fi