CDK -> FlexibleConnectedPositionStrategy does not work with SVG elements

[mirceapop89]

Reproduction

https://stackblitz.com/fork/cdk-overlay-issue

Steps to reproduce:

1. Hover the red circle.

Expected Behavior

The overlay should have been opened to the right of the circle, as it was configured so.

Actual Behavior

The overlay was opened in the top left corner of the page.

Environment

• Angular: 8.2.14 and 7.2.15
• CDK/Material: 8.2.3 and 7.3.7
• Browser(s): Chrome 80.0.3987.106 but older versions too
• Operating System: macOS and Ubuntu

[crisbeto]

Will be fixed by #18595.

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