Revert "mediawiki: do not clear session cache on every start"

pkgs/by-name/me/mediawiki/keep-session-object-cache.diff

@@ -1,13 +0,0 @@
-diff --git a/includes/Installer/DatabaseUpdater.php b/includes/Installer/DatabaseUpdater.php
-index 8ed996b9dee..733a3210096 100644
---- a/includes/Installer/DatabaseUpdater.php
-+++ b/includes/Installer/DatabaseUpdater.php
-@@ -1380,7 +1380,7 @@ public function purgeCache() {
- 		// ObjectCache
- 		$this->db->newDeleteQueryBuilder()
- 			->deleteFrom( 'objectcache' )
--			->where( ISQLPlatform::ALL_ROWS )
-+			->where( "keyname NOT LIKE '%:MWSession:%'" )
- 			->caller( __METHOD__ )
- 			->execute();
- 

pkgs/by-name/me/mediawiki/package.nix

@@ -14,12 +14,6 @@ stdenvNoCC.mkDerivation rec {
     hash = "sha256-XqjB8yHJ+Nuk0aweTsoYJ/sTUZ1KIZDiOfUUMgWKQmk=";
   };
 
-  patches = [
-    # NixOS runs the update script on every start as we might need to run some migrations.
-    # Normally this clears all active sessions, for usability we do not do that.
-    ./keep-session-object-cache.diff
-  ];
-
   postPatch = ''
     substituteInPlace includes/installer/CliInstaller.php \
       --replace-fail '$vars = Installer::getExistingLocalSettings();' '$vars = null;'