update: 'layout-wrap' injector should support reverse

[ThomasBurleson]

the LayoutWrap injector should support:

Attribute	CSS
layout-wrap	flex-wrap : wrap
layout-wrap="no"	flex-wrap : nowrap
layout-wrap="nowrap"	flex-wrap : nowrap
layout-wrap="none"	flex-wrap : nowrap
layout-wrap="reverse"	flex-wrap : wrap-reverse

[ThomasBurleson]

References angular/material#4132

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