Coding Standards: Use strict comparison where static strings are involved.

This reduces the number of `WordPress.PHP.StrictComparisons.LooseComparison` issues in half, from 1897 to 890.

Includes minor code layout fixes for better readability.

See #49542.
Built from https://develop.svn.wordpress.org/trunk@47808


git-svn-id: http://core.svn.wordpress.org/trunk@47584 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/admin-header.php

@@ -147,7 +147,7 @@ do_action( "admin_head-{$hook_suffix}" ); // phpcs:ignore WordPress.NamingConven
  */
 do_action( 'admin_head' );
 
-if ( get_user_setting( 'mfold' ) === 'f' ) {
+if ( 'f' === get_user_setting( 'mfold' ) ) {
 	$admin_body_class .= ' folded';
 }