Add CSS & update selectors so that controls added in the `extra_tablenav` region of list tables inherit the compact sizing used by core table nav controls.
Reviewed by johnbillion.
Props johnbillion, hbhalodia, mukesh27, sabernhardt, abdullah17, r1k0, joedolson, nilambar, shailu25.
Fixes#64796.
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git-svn-id: http://core.svn.wordpress.org/trunk@61397 1a063a9b-81f0-0310-95a4-ce76da25c4cd