We were supposed to initialize `last_htlcs_created_index` but a typo made us initialize `last_forwards_created_index` instead. Fix up the overwritten one, and actually initialize the one we were supposed to. Fixes: https://github.com/ElementsProject/lightning/issues/8269 Fixes: https://github.com/ElementsProject/lightning/issues/8270 Changelog-None: recently introduced bug Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>