remove calls to removed file, fixes #4468

Closes #4468

Merge request studip/studip!3255

db/migrations/1.45_refine_logevents.php

-<?
-require_once 'lib/admission.inc.php';
+<?php
 class RefineLogevents extends Migration
 {
 
@@ -59,4 +58,3 @@ class RefineLogevents extends Migration
 
     }
 }
-?>

db/migrations/1.49_step_00150_studygroups.php

-<?
-require_once 'lib/admission.inc.php';
+<?php
 class Step00150Studygroups extends Migration
 {
 
@@ -71,4 +70,3 @@ Ich erkläre mich damit einverstanden, dass Admins die Inhalte der Gruppe zu Kon
         DBManager::get()->query("ALTER TABLE config CHANGE value value varchar(255) NOT NULL");
     }
 }
-?>