Right now the "speed up" shows on the most recent tx with lowest nonce.

If that most recent tx is a cancellation attempt, the "speed up" button shows on the cancellation attempt.

So, if I submit a tx, it takes a long time, I try to cancel, then I decide I should just speed up the original tx, I'm unable to do so since the "Speed up" button is now on the cancellation attempt and not on the original tx.

If a user tries to cancel, we should probably show the "Speed up" button on both the original transaction AND the cancellation attemp

inspired by this comment

@alextsg