Drag Drop: mat-grid-tile does not retain height when being dragged

#### What is the expected behavior?
When dragging an item in a list, element rendered next to the user's cursor should look exactly like the element that is being dragged.

#### What is the current behavior?
Height changes and becomes bigger when item is being dragged

#### What are the steps to reproduce?
I use Mat-Grid-List example available in the docs at https://stackblitz.com/angular/oegmxkolgyr?file=app%2Fgrid-list-overview-example.html

Just display it on one line because of "Drag Drop Sortable, mixed orientation support (#13372 )" bug and add drag/drop like this:

```

1
2
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4

```


When rowHeight is set to a ratio, height of item being drag changes.

Any solution to keep height at correct ratio?

Start by reproducing the issue in the linked StackBlitz using the mat-grid-list markup and a ratio-based rowHeight. Inspect the interaction between mat-grid-tile and drag/drop during the drag preview. Done means the dragged tile retains the same height-to-width ratio as the original tile.

Written by the indexing model from the issue text.