Revert "Update theme for ChannelPanelActivity"

This reverts commit 41eeb31b200fa6764432378d974c01c3a17d843a.

Reason for revert: b/284380876

Change-Id: Ia06bf047db187091753e560f70427abb5b26378a
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 08fbf04..6fe6832 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -3717,7 +3717,7 @@
         <!-- Show channel-level notification settings (channel passed in as extras) -->
         <activity android:name=".notification.app.ChannelPanelActivity"
                   android:label="@string/notification_channel_title"
-                  android:theme="@style/Theme.Panel.Material"
+                  android:theme="@style/Theme.Panel"
                   android:excludeFromRecents="true"
                   android:configChanges="keyboardHidden|screenSize"
                   android:exported="true">
diff --git a/res/drawable/button_border_selected.xml b/res/drawable/button_border_selected.xml
index 1402380..0cd4aa5 100644
--- a/res/drawable/button_border_selected.xml
+++ b/res/drawable/button_border_selected.xml
@@ -15,7 +15,10 @@
   limitations under the License.
   -->
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
+       xmlns:androidprv="http://schemas.android.com/apk/prv/res/android"
        android:shape="rectangle">
+    <solid
+        android:color="?androidprv:attr/materialColorSurfaceContainer" />
     <stroke
         android:width="2dp"
         android:color="?android:attr/colorAccent"/>
diff --git a/res/drawable/button_border_unselected.xml b/res/drawable/button_border_unselected.xml
index d0ce75b..2c2ef3d 100644
--- a/res/drawable/button_border_unselected.xml
+++ b/res/drawable/button_border_unselected.xml
@@ -18,7 +18,7 @@
        android:shape="rectangle">
     <stroke
         android:width="1dp"
-        android:color="?android:attr/colorAccent"/>
+        android:color="@color/notification_importance_button_unselected"/>
 
     <corners android:radius="@dimen/rect_button_radius" />
 </shape>
diff --git a/res/values/themes.xml b/res/values/themes.xml
index 8f13279..eeba1c7 100644
--- a/res/values/themes.xml
+++ b/res/values/themes.xml
@@ -227,9 +227,6 @@
         <item name="android:fontFamily">@*android:string/config_headlineFontFamilyMedium</item>
     </style>
 
-    <style name="Theme.Panel.Material" parent="Theme.Panel" >
-        <item name="android:switchStyle">@style/Switch.SettingsLib</item>
-    </style>
     <!-- Material theme for the pages containing TabLayout and ViewPager -->
     <style name="Theme.TabTheme" parent="@style/Theme.MaterialComponents.DayNight">
         <item name="colorPrimary">@*android:color/edge_effect_device_default_light</item>