auto_update_rust_bootstrap: fix whitespace in commit message

auto_update_rust_bootstrap.py writes commit messages using f-strings
and textwrap.dedent. However, dedent only removes whitespace from
the beginning of lines, and the code used line continuations that
cause repeated whitespace inside of lines. This change moves things
around a bit so that messages are formatted as expected.

BUG=None
TEST=Ran the script, checked the resulting commit message.

Change-Id: Ia9ba93b64bcb214d17e90e96567349c3bd7fdeb6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/5259243
Reviewed-by: George Burgess <gbiv@chromium.org>
Commit-Queue: Bob Haarman <inglorion@chromium.org>
Tested-by: Bob Haarman <inglorion@chromium.org>
1 file changed