SVN: Trim trailing whitespace to match `ignore` entry exactly.

When the entry for `wp-cli.local.yml` was added in r30057, it included a trailing whitespace. Presumably, that doesn't cause any problems with some combinations of OS/SVN client/EOL markers/etc, but in some cases it will prevent the entry from being ignored. After removing the whitespace, the file is ignored as expected.

See #30134.

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git-svn-id: https://core.svn.wordpress.org/trunk@44192 1a063a9b-81f0-0310-95a4-ce76da25c4cd