Sergey Biryukov 6b8460ee43 Customizer: Trim whitespace from custom link URLs.
This complements a similar fix for the Menus screen in [45655].

Props donmhico, audrasjb.
Merges [45869] to the 5.2 branch.
Fixes #47888. See #47723.
Built from https://develop.svn.wordpress.org/branches/5.2@45870


git-svn-id: http://core.svn.wordpress.org/branches/5.2@45681 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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