Revert "TEST-25-IMPORT: Skip if importctl not installed"

This reverts commit dcb17e3295.

importctl is now correctly installed on opensuse, so no need for
this workaround anymore.

test/units/testsuite-25.sh

@@ -3,11 +3,6 @@
 set -eux
 set -o pipefail
 
-if ! command -v importctl >/dev/null; then
-    echo "importctl is not available to be chain-loaded from machinectl, skipping" >>/skipped
-    exit 77
-fi
-
 export SYSTEMD_PAGER=cat
 
 dd if=/dev/urandom of=/var/tmp/testimage.raw bs=$((1024*1024+7)) count=5