[suse] remove --no-confirm from zypper invocation

this is basically the deprecated version of --non-interactive, which is
already being used, so this is duplicate and only causes warnings but
doesn't help with anything

Change-Id: Ic98790461636c4136b7005bdc31ce08f8ca81e0f

elements/zypper-minimal/root.d/08-zypper-chroot

@@ -37,7 +37,7 @@ function cleanup() {
 trap cleanup EXIT
 
 ZYPPER_TARGET_OPTS="--non-interactive --gpg-auto-import-keys --root $TARGET_ROOT"
-ZYPPER_INSTALL_OPTS="--no-confirm --no-recommends"
+ZYPPER_INSTALL_OPTS="--no-recommends"
 
 for repo in ${ZYPPER_REPOS}; do
     reponame=repo-${repo%%=>*}