The "Continue Reading" link that's generated by the More block is styled to include an arrow next to the text; that arrow shouldn't inherit the text underline style. This update removes it.
Props littlebigthing, kjellr.
Fixes#45715.
Built from https://develop.svn.wordpress.org/trunk@44369
git-svn-id: http://core.svn.wordpress.org/trunk@44199 1a063a9b-81f0-0310-95a4-ce76da25c4cd