lnwallet: update commitScriptToSelf to match BOLT-0003
lnwallet: update commitScriptToSelf to match BOLT-0003

This commit updates the script we use to match the current
specification. The change is minor: we can say an extra byte by moving
the OP_CHECKSIG to the end of the script, and swapping the checks and
seqverify operations in the second clause. However, the witness remains
the same!

LightningNetwork/lnd,aakselrod/lnd,LightningNetwork/lnd,ddustin/lnd,ddustin/lnd,aakselrod/lnd