General: Fix some precision alignment formatting warnings.

The WPCS `WordPress.WhiteSpace.PrecisionAlignment` rule throws warnings for a bunch of code that will likely cause issues for `wpcbf`. Fixing these manually beforehand gives us better auto-fixed results later.

See #41057.



git-svn-id: https://develop.svn.wordpress.org/trunk@42228 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/wp-db.php

@@ -208,7 +208,7 @@ class wpdb {
 	 * @since 3.0.0
 	 * @var string
 	 */
-	 public $base_prefix;
+	public $base_prefix;
 
 	/**
 	 * Whether the database queries are ready to start executing.