fix(panel): fix propagateContainerEvents

[GuyPie]

Change $mdPanel with propagateContainerEvents set to true to not close when it is clicked. #GoodnessSquad

Fixes: #10495

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[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks.

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[GuyPie]

I signed it!

[googlebot]

CLAs look good, thanks!

[googlebot]

CLAs look good, thanks!

[EladBezalel]

@ErinCoughlan can you please take a look ? :)

[ErinCoughlan]

LGTM