Format Python scripts under web_tests/external/wpt/html/canvas/tools.

Formatted with `git cl format --full`, but with this line commented
out (web_tests/external/wpt is excluded from automated formatting):
https://crsrc.org/c/.yapfignore;l=6;drc=a6a7b65891b7f2d3a0a9392edc63ce71ed4e5554

Change-Id: Id47cb362b64940421c0071d358240e24f17c05d5
Bug: 1409873
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4189388
Commit-Queue: Jean-Philippe Gravel <jpgravel@chromium.org>
Reviewed-by: Yi Xu <yiyix@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1096840}

third_party/blink/web_tests/external/wpt/html/canvas/tools/gentest.py

@@ -1,6 +1,8 @@
 from gentestutils import genTestUtils
 from gentestutilsunion import genTestUtils_union
 
-genTestUtils('../element', '../element', 'templates.yaml', 'name2dir-canvas.yaml', False)
-genTestUtils('../offscreen', '../offscreen', 'templates.yaml', 'name2dir-offscreen.yaml', True)
-genTestUtils_union('templates-new.yaml', 'name2dir.yaml')
+genTestUtils('../element', '../element', 'templates.yaml',
+             'name2dir-canvas.yaml', False)
+genTestUtils('../offscreen', '../offscreen', 'templates.yaml',
+             'name2dir-offscreen.yaml', True)
+genTestUtils_union('templates-new.yaml', 'name2dir.yaml')