WPDB: Remove the addition of `STRICT_ALL_TABLES`, added in [30400]. This proved to be incompatible with too many plugins, as well as being incompatible with MySQL 5.7.

See #21212.

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Twenty Fifteen: minor corrections to borders and post title colors in custom color schemes.

Props iamtakashi, fixes #30521.



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Twenty Fifteen: overflow hidden can hide focus outlines here so out it goes.

Props iamtakashi, fixes #30523.


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Twenty Fifteen: better highlights for tapped links in iOS Safari.

Props iamtakashi, fixes #30524.



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git-svn-id: http://core.svn.wordpress.org/trunk@30580 1a063a9b-81f0-0310-95a4-ce76da25c4cd