lxd/api/internal: Replace d.db.Cluster.GetLocalStoragePoolVolume with tx.GetStoragePoolVolume usage
lxd/api/internal: Replace d.db.Cluster.GetLocalStoragePoolVolume with tx.GetStoragePoolVolume usage

Signed-off-by: Thomas Parrott <6b778ce645fb0e3dde76d79eccad490955b1ae74@canonical.com>

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