Loader: CodeHealth: Add curly braces as per the latest style guide

This may or may not be a mechanical change. The good news is that either
way it's something that only needs to be done once en mass. Or the
codebase could eventually get there whenever someone decides to do it
and a reviewer decides to allow it. This just accelerates things a bit
to make the code easier to read using the latest recommendations.

Bug: chromium:346952289
Change-Id: Ide8fe8aa43c912013c5c0a439fad93dfb2fde8f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5875284
Commit-Queue: Solomon Kinard <solomonkinard@chromium.org>
Reviewed-by: mmenke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1357688}