I18N: After [35884], remove `html_entity_decode()` for the thousands separator...

I18N: After [35884], remove `html_entity_decode()` for the thousands separator in `WP_Locale::init()`, use the ` ` entity directly.

We can't `get_option( 'blog_charset' )` here, because the database may not be available.

Fixes #10373.
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git-svn-id: https://core.svn.wordpress.org/trunk@35915 1a063a9b-81f0-0310-95a4-ce76da25c4cd