Update UI: header image

V2rayNG/app/src/main/res/layout/nav_header.xml

@@ -3,7 +3,7 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="@dimen/nav_header_height"
-    android:background="@drawable/nav_header_bg"
+    android:background="@drawable/nav_header_bg_white"
     android:gravity="center"
     android:orientation="vertical"
     android:paddingBottom="@dimen/activity_vertical_margin"
@@ -18,7 +18,7 @@
         android:layout_gravity="center"
         android:paddingTop="@dimen/nav_header_vertical_spacing"
         android:text="@string/app_name"
-        android:textColor="@color/white"
+        android:textColor="@color/colorText"
         android:textAppearance="@style/TextAppearance.AppCompat.Display1" />