Make disabled flat button consistent with enabled.

[vukisoft]

While enabled flat (not raised) button has no background, disabled version does which is inconsistent and looks bad. Change adds background for raised disabled buttons only.

[googlebot]

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[vukisoft]

I signed it!

On Thu, 26 Jul 2018 02:56:55 -0700, googlebot wrote:

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[googlebot]

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