Move testing/tools/.style.yapf to the root directory.

Make it possible to auto-format all Python files in PDFium.

Change-Id: Ie37ef5561846d35e2aba8f532c46462b1a653831
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/68570
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/testing/tools/.style.yapf b/.style.yapf
similarity index 100%
rename from testing/tools/.style.yapf
rename to .style.yapf