EIP-1057: fix table formatting.

[veox]

The website at https://eips.ethereum.org/EIPS/eip-1057 does not render the table in the "Test Cases" section (at the bottom).

Hopefully, this is caused by the top/bottom lines, that get interpreted as horisontal breaks.

This PR tries to follow github's help page on table formatting more closely, removing the lines, and explicitly denoting content column alignment.

[eip-automerger]

Hi! I'm a bot, and I wanted to automerge your PR, but couldn't because of the following issue(s):

• EIP 1057 requires approval from one of (ifdefelse@protonmail.com, radix.pi.314@gmail.com)

[veox]

Ping @ifdefelse.

[axic]

Based on

github.com/ifdefelse
ProgPoW is an specialized hardware resistance effort spearheaded by “Miss If” (a.k.a OhGodAGirl), “Mr. Else” (a.k.a RadixPi) and “Mr. Def”.

@OhGodAGirl @RadixPi @ifdefelse can you please approve/reject this change?

[axic]

Ping @ifdefelse

[ifdefelse]

The table's out of date, and we just deleted it in PR #1589

[veox]

Then closing as obsolete.