OOBE css: Reflect spec change

So we won't miss it

TBR=antrim@chromium.org

Bug: 1000606
Change-Id: Ib52151c761b269d253c62a0e08b8c54f657e6709
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864773Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706800}

ui/login/oobe.css

@@ -56,7 +56,7 @@ html[screen=gaia-signin] {
   --oobe-dialog-side-margin: 0px;
 }
 
-@media screen and (max-width: 864px) {
+@media screen and (max-width: 864px), (max-height: 736px) {
   html[screen=oobe] {
     --oobe-dialog-footer-height: 80px;
     --oobe-dialog-footer-padding: 24px;