Update BottomNavigationView's Widget.MaterialComponents style variant…

…s to use

MaterialShapeDrawable.

PiperOrigin-RevId: 238732527

lib/java/com/google/android/material/bottomnavigation/res/values/styles.xml

@@ -30,9 +30,10 @@
        Use the default style to get the default bottom navigation bar with a colorSurface background and
        colorPrimary for the icon and text colors. -->
   <style name="Widget.MaterialComponents.BottomNavigationView" parent="Widget.Design.BottomNavigationView">
+    <item name="android:background">@null</item>
+    <item name="backgroundTint">?attr/colorSurface</item>
     <item name="enforceTextAppearance">true</item>
     <item name="enforceMaterialTheme">true</item>
-    <item name="android:background">?attr/colorSurface</item>
     <item name="itemBackground">@null</item>
     <item name="itemHorizontalTranslationEnabled">false</item>
     <item name="itemIconTint">@color/mtrl_bottom_nav_item_tint</item>
@@ -46,9 +47,10 @@
        Use the colored style to get a bottom navigation bar with a colorPrimary background and
        percentages of colorOnPrimary for the icon and text colors. -->
   <style name="Widget.MaterialComponents.BottomNavigationView.Colored">
+    <item name="android:background">@null</item>
+    <item name="backgroundTint">?attr/colorPrimary</item>
     <item name="enforceTextAppearance">true</item>
     <item name="enforceMaterialTheme">true</item>
-    <item name="android:background">?attr/colorPrimary</item>
     <item name="itemIconTint">@color/mtrl_bottom_nav_colored_item_tint</item>
     <item name="itemRippleColor">@color/mtrl_bottom_nav_colored_ripple_color</item>
     <item name="itemTextAppearanceInactive">?attr/textAppearanceCaption</item>