Change the app icon

Closes #6189

res/layout/create_passphrase_activity.xml

@@ -1,38 +1,27 @@
 <?xml version="1.0" encoding="utf-8"?>
 
-<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
-            android:id="@+id/scroll_parent"
-            android:layout_width="match_parent"
-            android:layout_height="match_parent"
-            android:fillViewport="true"
-            android:background="@drawable/background_pattern_repeat">
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                android:id="@+id/prompt_layout"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:background="@color/signal_primary">
 
-  <RelativeLayout android:id="@+id/prompt_layout"
-                  android:layout_width="match_parent"
-                  android:layout_height="wrap_content">
 
-    <ImageView android:id="@+id/watermark"
-               android:layout_width="wrap_content"
-               android:layout_height="wrap_content"
-               android:layout_centerHorizontal="true"
-               android:layout_marginBottom="20dp"
-               android:src="@drawable/lockscreen_watermark_light"
-               android:contentDescription="@string/PassphrasePromptActivity_watermark_content_description"
-               android:layout_marginTop="100dp"/>
+  <ProgressBar android:id="@+id/passphrase_edit"
+               android:layout_width="75dp"
+               android:layout_height="75dp"
+               android:indeterminate="true"
+               android:padding="10dp"
+               android:layout_centerInParent="true"
+               style="?android:attr/progressBarStyleLargeInverse"/>
 
-    <RelativeLayout android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_below="@id/watermark">
+  <ImageView android:id="@+id/watermark"
+             android:layout_width="wrap_content"
+             android:layout_height="wrap_content"
+             android:layout_centerHorizontal="true"
+             android:layout_marginBottom="20dp"
+             android:layout_above="@id/passphrase_edit"
+             android:src="@drawable/icon_transparent"
+             android:contentDescription="@string/PassphrasePromptActivity_watermark_content_description"/>
 
-      <ProgressBar android:id="@+id/passphrase_edit"
-                   android:layout_width="75dp"
-                   android:layout_height="75dp"
-                   android:indeterminate="true"
-                   android:padding="10dp"
-                   android:layout_centerHorizontal="true"/>
-
-    </RelativeLayout>
-
-  </RelativeLayout>
-
-</ScrollView>
+</RelativeLayout>