matRippleDisabled at mat-datepicker-toggle

[oky1]

Bug, feature request, or proposal:

matRippleDisabled at mat-datepicker-toggle

What is the expected behavior?

matRippleDisabled should disable ripple on button

What is the current behavior?

Not disabled ripple on button

What are the steps to reproduce?

Add matRippleDisabled at mat-datepicker-toggle component

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Ang 7.0, Crome 0.0.3538.77, AngMaterial 7.0

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