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This CL tweaks the `top` of barcode-chip-container to avoid collision
with scan-box or preview-box in responsive layout.

Bug: b/172879638
Test: Manually resize the window and scan barcodes.
Change-Id: I52d74d30e1bf473f320a374b04b383428b16804e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2596590
Commit-Queue: Shik Chen <shik@chromium.org>
Reviewed-by: Wei Lee <wtlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839430}