UI: Clean up Interact form markup

This re-adds the native attribute for the OBSQTDisplay that was removed in #3782. I believe this particular removal was an error, and there is no way around this entry being native since OBSQTDisplay extends QWidget

UI/forms/OBSBasicInteraction.ui

@@ -18,7 +18,7 @@
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
    <item>
-    <widget class="OBSQTDisplay" name="preview">
+    <widget class="OBSQTDisplay" name="preview" native="true">
      <property name="sizePolicy">
       <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
        <horstretch>0</horstretch>