deps: revert whitespace changes on V8

While landing some of the V8 upgrades on the v12 branch, something went
wrong and git made unecessary (and incorrect) whitespace changes to test
fixtures, which broke V8 tests. This was likely caused by the use of
`git node land` or a simiar tool. Revert those changes to fix our tests.
Since this only reverts unwanted changes on deps/v8, and it only affects
tests, don't bump v8_embedder_string.

PR-URL: https://github.com/nodejs/node/pull/32605


Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Shelley Vohr <codebytere@gmail.com>