Ensure transparent landing screen navigation bar on Android 29+

Author: ovitrif

WordPress/src/main/res/values-v29/styles_login.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <style name="LoginTheme.TransparentSystemBars" parent="LoginTheme.BaseTransparentSystemBars">
+        <item name="android:enforceNavigationBarContrast">false</item>
+    </style>
+
+</resources>

WordPress/src/main/res/values/styles_login.xml

@@ -8,11 +8,13 @@
         <item name="colorSecondaryVariant">@color/colorSecondaryVariant</item>
     </style>
 
-    <style name="LoginTheme.TransparentSystemBars" parent="LoginTheme">
+    <style name="LoginTheme.BaseTransparentSystemBars" parent="LoginTheme">
         <item name="android:statusBarColor">@android:color/transparent</item>
         <item name="android:navigationBarColor">@android:color/transparent</item>
     </style>
 
+    <style name="LoginTheme.TransparentSystemBars" parent="LoginTheme.BaseTransparentSystemBars" />
+
     <style name="Login.EmptyView.TextView.Username" parent="android:Widget.TextView">
         <item name="android:textSize">@null</item>
         <item name="android:textAppearance">?attr/textAppearanceSubtitle2</item>