Qt: Change post settings style to sunken

src/duckstation-qt/postprocessingchainconfigwidget.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>721</width>
-    <height>194</height>
+    <height>210</height>
    </rect>
   </property>
   <property name="sizePolicy">

src/duckstation-qt/postprocessingsettingswidget.cpp

@@ -56,10 +56,11 @@ void PostProcessingSettingsWidget::onChainSelectedShaderChanged(qint32 index)
 
 void PostProcessingSettingsWidget::updateShaderConfigPanel(s32 index)
 {
+  m_ui.scrollArea->setWidget(nullptr);
+  m_ui.scrollArea->setVisible(false);
+
   if (m_shader_config)
   {
-    m_ui.scrollArea->setWidget(nullptr);
-    m_ui.scrollArea->setVisible(false);
     delete m_shader_config;
     m_shader_config = nullptr;
   }

src/duckstation-qt/postprocessingsettingswidget.ui

@@ -93,6 +93,12 @@
        <verstretch>1</verstretch>
       </sizepolicy>
      </property>
+     <property name="frameShape">
+      <enum>QFrame::WinPanel</enum>
+     </property>
+     <property name="frameShadow">
+      <enum>QFrame::Sunken</enum>
+     </property>
      <property name="widgetResizable">
       <bool>true</bool>
      </property>
@@ -101,8 +107,8 @@
        <rect>
         <x>0</x>
         <y>0</y>
-        <width>681</width>
-        <height>390</height>
+        <width>679</width>
+        <height>438</height>
        </rect>
       </property>
      </widget>