(paul): support `program` as well. See https://github.com/angular/material2/issues/9889

[piascikj]

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opened via imdone.io from a code comment on 53417d49e by Paul Gschwendtner

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material2/src/lib/button-toggle/button-toggle.scss

Lines 44 to 49 in 915a2b7

	// TODO(paul): support `program` as well. See https://github.com/angular/material2/issues/9889
	&.cdk-keyboard-focused {
	.mat-button-toggle-focus-overlay {
	opacity: 1;
	}
	}