TT#16553 Fix bcad82f: call grml-chroot with non-quoted command

Otherwise we have an error here:

> +13:32:28 (netscript.grml:1391): main():  grml-chroot /mnt 'wget "https://deb.sipwise.com/autobuild/pool/main/n/ngcp-installer//ngcp-installer-carrier_6.5.0.0+0~mr6.5.0.0+0~20180912105833.1234+stretch~1.gbp81c047_all.deb"'
> Writing /etc/debian_chroot ...
> chroot: failed to run command 'wget "https://deb.sipwise.com/autobuild/pool/main/n/ngcp-installer//ngcp-installer-carrier_6.5.0.0+0~mr6.5.0.0+0~20180912105833.1234+stretch~1.gbp81c047_all.deb"': No such file or directory
> ++13:32:28 (netscript.grml:1391): main():  wait_exit

Change-Id: I4b600448a81bf60097c9693b6de79998a3dd47c4

templates/scripts/includes/deployment.sh

@@ -1388,9 +1388,9 @@ if "$NGCP_INSTALLER" ; then
   set_repos
 
   echo "Installing package ngcp-installer: ${INSTALLER}"
-  grml-chroot "${TARGET}" "wget \"${INSTALLER_PATH}/${INSTALLER}\""
-  grml-chroot "${TARGET}" "dpkg -i \"${INSTALLER}\""
-  grml-chroot "${TARGET}" "rm -f \"${INSTALLER}\""
+  grml-chroot "${TARGET}" wget "${INSTALLER_PATH}/${INSTALLER}"
+  grml-chroot "${TARGET}" dpkg -i "${INSTALLER}"
+  grml-chroot "${TARGET}" rm -f "${INSTALLER}"
 
   echo "Generating ngcp-installer configs ..."
   gen_installer_config