Tweak splash screen color, set nav bar to match (#2476)

Tweak splash screen color, set nav bar to match

app/src/main/res/drawable/splash_background.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
 
-    <item android:drawable="@color/colorSplash" />
+    <item android:drawable="@color/colorPrimary" />
 
     <item>
         <bitmap

app/src/main/res/values/colors.xml

@@ -8,8 +8,6 @@
     <color name="colorDarkPrimaryDark">#1C1C1D</color>
     <color name="colorAmoledPrimary">@color/md_black_1000</color>
 
-    <color name="colorSplash">#455A64</color>
-
     <!-- Light Theme -->
     <color name="colorAccentLight">@color/md_blue_A400</color>
     <color name="textColorPrimaryLight">@color/md_black_1000_87</color>

app/src/main/res/values/themes.xml

@@ -158,6 +158,7 @@
     <!--===============-->
     <style name="Theme.Splash" parent="Theme.Tachiyomi">
         <item name="android:windowBackground">@drawable/splash_background</item>
+        <item name="android:navigationBarColor">@color/colorPrimary</item>
     </style>