TT#28474 usage of "sed -ie": /etc/default/grube [sic] present in VMs

Due to using "sed -ie", the "e" in this case means a suffix for
backup, so it leaves the old version of the file in /etc/default/grube
after modifying /etc/default/grub, and this was not the intention, so
simply dropping the "e".

Change-Id: I81184e80db0b3327d09f23f769f74ea55f4376de

deployment.sh

@@ -293,7 +293,7 @@ install_vbox_iso() {
 
 set_custom_grub_boot_options() {
   echo "Adjusting default GRUB boot options (enabling net.ifnames=0)"
-  sed -ie 's/^GRUB_CMDLINE_LINUX_DEFAULT="\(.*\)"/GRUB_CMDLINE_LINUX_DEFAULT="\1 net.ifnames=0"/' "${TARGET}/etc/default/grub"
+  sed -i 's/^GRUB_CMDLINE_LINUX_DEFAULT="\(.*\)"/GRUB_CMDLINE_LINUX_DEFAULT="\1 net.ifnames=0"/' "${TARGET}/etc/default/grub"
 
   echo "Invoking update-grub"
   grml-chroot $TARGET update-grub