Show the Extra column in wp db columns on SQLite

`columns()` dropped `Extra` from the output on SQLite because the old
SQLite drop-in did not return that field from `SHOW COLUMNS`. The
MySQL-on-SQLite driver in sqlite-database-integration 3.0 returns the
full MySQL-compatible column set, so the workaround now hides
information that is available, notably `auto_increment`.

With `Extra` restored, the SQLite variant of the `db columns` scenario
expects exactly what the MySQL variant does, so drop the duplicate.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MXbmdB7hvQ2jwEe64h6s5K

Author: claude

features/db-columns.feature

@@ -41,7 +41,6 @@ Feature: Display information about a given table.
       Couldn't find any tables matching: wp_foobar
       """
 
-  @require-mysql-or-mariadb
   Scenario: Display information about a non default WordPress table
     Given a WP install
     And I run `wp db query "CREATE TABLE not_wp ( date DATE NOT NULL, awesome_stuff TEXT, PRIMARY KEY (date) );;"`
@@ -51,15 +50,3 @@ Feature: Display information about a given table.
       | Field         | Type       | Null | Key | Default | Extra |
       | date          | date       | NO   | PRI |         |       |
       | awesome_stuff | text       | YES  |     |         |       |
-
-  @require-sqlite
-  Scenario: Display information about a non default WordPress table
-    Given a WP install
-    And I run `wp db query "CREATE TABLE not_wp ( date DATE NOT NULL, awesome_stuff TEXT, PRIMARY KEY (date) );;"`
-
-    When I try `wp db columns not_wp`
-    # The `Extra` column is left out because `wp db columns` omits it on SQLite.
-    Then STDOUT should be a table containing rows:
-      | Field         | Type       | Null | Key | Default |
-      | date          | date       | NO   | PRI |         |
-      | awesome_stuff | text       | YES  |     |         |

src/DB_Command.php

@@ -1942,10 +1942,6 @@ public function columns( $args, $assoc_args ) {
 
 		$formatter_fields = [ 'Field', 'Type', 'Null', 'Key', 'Default', 'Extra' ];
 
-		if ( $this->is_sqlite() ) {
-			$formatter_fields = [ 'Field', 'Type', 'Null', 'Key', 'Default' ];
-		}
-
 		$formatter_args = [
 			'format' => $format,
 		];