John Blackbourn f4f66b96b1 Customize: Increase the colour contrast of the line numbers in CodeMirror.
Props earnjam, abdullahramzan, audrasjb, Luminus

Fixes #44763

Merges [43574] to the 4.9 branch.

Built from https://develop.svn.wordpress.org/branches/4.9@43575


git-svn-id: http://core.svn.wordpress.org/branches/4.9@43404 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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