[wp-trac] [WordPress Trac] #37447: Remove redundant `is_multisite()` checks in network admin templates

[WordPress Trac]

#37447: Remove redundant `is_multisite()` checks in network admin templates
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 Reporter:  flixos90        |      Owner:
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Administration  |    Version:  3.1
 Severity:  normal          |   Keywords:  needs-patch
  Focuses:  multisite       |
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 Most of the templates for the network admin have a check for
 `is_multisite()` in the beginning of the file. However there's already
 such a check happening in the `admin.php` file for the network admin,
 making these additional checks redundant. Let's remove them.

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Ticket URL: <https://core.trac.wordpress.org/ticket/37447>
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