fix(legacy): avoid crash when lot of streams in configuration (#2915)

### Description

lot of streams forbid
http://libretime.example.org/preference/stream-setting to open (max=4)
this patch prevent the crash by displaying an error message and truncate
streamcount to 4.

Co-authored-by: Kyle Robbertze <paddatrapper@users.noreply.github.com>

legacy/application/controllers/PreferenceController.php

@@ -156,6 +156,11 @@ class PreferenceController extends Zend_Controller_Action
         $setting = Application_Model_StreamSetting::getStreamSetting();
         $form->setSetting($setting);
 
+        if ($num_of_stream > MAX_NUM_STREAMS) {
+            Logging::error('Your streams count (' . $num_of_stream . ') exceed the maximum, some of them will not be displayed');
+            $num_of_stream = MAX_NUM_STREAMS;
+        }
+
         for ($i = 1; $i <= $num_of_stream; ++$i) {
             $subform = new Application_Form_StreamSettingSubForm();
             $subform->setPrefix($i);