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This change replaces the reference to the deprecated "isTestCommand"
setting in keybindings.json5 with its replacement, "group": "test".
This makes keybindings.json5 match tasks.json5, which uses the new
syntax.

This also fixes a small typo.

Change-Id: Ie5a6cdb22610f27222105ff079e47dddd7160378
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432138Reviewed-by: Chase Phillips <cmp@chromium.org>
Commit-Queue: Chase Phillips <cmp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813841}