Revert of [ignition] Decrease code size multiiplier to 24. (patchset #1 id:1 of https://codereview.chromium.org/2758503002/ )

Reason for revert:
Doesn't seem to help with peak performance, and seems to hurt startup performance a bit, so reverting for now

Original issue's description:
> [ignition] Decrease code size multiplier to 24.
>
> BUG=
>
> Review-Url: https://codereview.chromium.org/2758503002
> Cr-Commit-Position: refs/heads/master@{#43861}
> Committed: https://chromium.googlesource.com/v8/v8/+/b880309bc7f2c4be67f12bac04249f09b0fdd66d

TBR=rmcilroy@chromium.org,jarin@chromium.org,danno@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review-Url: https://codereview.chromium.org/2751913007
Cr-Commit-Position: refs/heads/master@{#43891}