Fix issues with TV's Media Sources after upgrading to MODX 3 (#16338)

* Update legacy class references in `modMediaSourceElement::class` `object_class` column

This will fix an "PHP Fatal error: Cannot declare class modTemplateVarInputRenderText, because the name is already in use" after upgrade to MODX 3.

* Change @Property to @var in upgrade script

Co-authored-by: Jason Coward <jason@opengeek.com>

setup/includes/upgrades/common/3.0.3-update-legacy-class-references.php

@@ -11,7 +11,7 @@
 
 
 /**
- * @property modX $modx
+ * @var modX $modx
  */
 
 use MODX\Revolution\modChunk;
@@ -20,6 +20,7 @@
 use MODX\Revolution\modSnippet;
 use MODX\Revolution\modTemplate;
 use MODX\Revolution\modTemplateVar;
+use MODX\Revolution\Sources\modMediaSourceElement;
 
 /* modify legacy core class references in modElementPropertySet element_class column */
 
@@ -34,3 +35,13 @@
 $modx->updateCollection($class, ['element_class' => modTemplateVar::class], ['element_class' => 'modTemplateVar']);
 $modx->updateCollection($class, ['element_class' => modPlugin::class], ['element_class' => 'modPlugin']);
 $modx->updateCollection($class, ['element_class' => modSnippet::class], ['element_class' => 'modSnippet']);
+
+/* modify legacy core class references in modMediaSourceElement object_class column */
+
+$class = modMediaSourceElement::class;
+$table = $modx->getTableName($class);
+
+$elementClass = $this->install->lexicon('alter_column', ['column' => 'object_class', 'table' => $table]);
+$this->processResults($class, $elementClass, [$modx->manager, 'alterField'], [$class, 'object_class']);
+
+$modx->updateCollection($class, ['object_class' => modTemplateVar::class], ['object_class' => 'modTemplateVar']);