format GN files, and invert if->config to config->if

Both if (...) { config ... } else { config ... } and config { if (...) { ...}
else { ... } } work.  We just happen to do the if inside the config more often
than the other way around.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2347953002

Review-Url: https://codereview.chromium.org/2347953002
2 files changed