lxd-generate: Revert to deprecated strings.Title.
lxd-generate: Revert to deprecated strings.Title.

Usage of cases.Title(language.English).String(str) is subtely different
from strings.Title. For example, strings.Title("UUID") returns "UUID",
whereas cases.Title(language.English).String("UUID") returns "Uuid".
This is breaking the generated database code.

Signed-off-by: Mark Laing <e4eb1ed17d42befab1db63da5bbc17c0a2c16113@canonical.com>

lxc/lxd,stgraber/lxd,lxc/lxd,stgraber/lxd,stgraber/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd,stgraber/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,lxc/lxd,hallyn/lxd,hallyn/lxd,lxc/lxd,hallyn/lxd,stgraber/lxd,hallyn/lxd