Addon Manager: PR4556 Step 2: remove native=true

src/Mod/AddonManager/AddonManager.ui

@@ -15,7 +15,7 @@
   </property>
   <layout class="QVBoxLayout" name="verticalLayout_4">
    <item>
-    <widget class="QWidget" name="contentPlaceholder" native="true">
+    <widget class="QWidget" name="contentPlaceholder">
      <property name="sizePolicy">
       <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
        <horstretch>0</horstretch>

src/Mod/AddonManager/AddonManagerOptions.ui

@@ -258,7 +258,7 @@ of the line after a space (e.g. https://github.com/FreeCAD/FreeCAD master).</str
       </widget>
      </item>
      <item>
-      <widget class="Gui::PrefFileChooser" name="gui::preffilechooser" native="true">
+      <widget class="Gui::PrefFileChooser" name="gui::preffilechooser">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
          <horstretch>0</horstretch>

src/Mod/AddonManager/dependency_resolution_dialog.ui

@@ -28,7 +28,7 @@
      <property name="text">
       <string>This Addon has the following required and optional dependencies. You must install them before this Addon can be used.
 
-Do you want the Addon Manager to install them automatically? Choose &quot;Ignore&quot; to install the Addon without installing the dependencies.</string>
+Do you want the Addon Manager to install them automatically? Choose "Ignore" to install the Addon without installing the dependencies.</string>
      </property>
      <property name="wordWrap">
       <bool>true</bool>