Fixing format in data_grid_test.ts
Fixing format in data_grid_test.ts

Fixing format in this test file

Bug: none
Change-Id: I67bed035f96323a90030fe0f136d37eb801c0779
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3161605
Reviewed-by: Alex Rudenko <d8d88e7d7e77f69e23d1d1432231196fb8e02a62@chromium.org>
Commit-Queue: Christy Chen <c65683e4a5ee30f610e160e4a73e5e01afd6eeda@microsoft.com>

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