https://webkit.org/b/158340 has been fixed

So remove its entry from the Wall.
Refs #20012, #20024
Refs http://trac.webkit.org/changeset/202324

[ci skip]

docs/_data/browser-bugs.yml

@@ -268,16 +268,6 @@
   origin: >
     Bootstrap#17403
 
--
-  browser: >
-    Safari
-  summary: >
-    `:hover` CSS pseudo-class sometimes keeps matching ever after mouse has left the element
-  upstream_bug: >
-    WebKit#158340
-  origin: >
-    Bootstrap#20012
-
 -
   browser: >
     Safari