Inconsistent chip bottom margin in mat-chip-list

[josef-jelinek]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Chips in the mat-chip-list are aligned vertically.

What is the current behavior?

The chips are misaligned with the first one.

The responsible change is at
7a42706#diff-2252115b723be2ad192335df6b5e9be8R32
which adds 3px bottom margin to all except the first chip (unless it is a stacked chip-list).

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