Dominik Schilling f6cbf30494 Update/Install: Remove the .notice-error class before adding classes for the update process.
Prevents displaying an update message with error styling.

Merge of [38209] to the 4.6 branch.

Props obenland.
Props SergeyBiryukov for review.
See #37550.
Built from https://develop.svn.wordpress.org/branches/4.6@38210


git-svn-id: http://core.svn.wordpress.org/branches/4.6@38151 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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