Get rid of old references to @drawable/icon.

Fixes #7957

AndroidManifest.xml

@@ -193,9 +193,9 @@
         </intent-filter>
 
         <meta-data android:name="com.sec.minimode.icon.portrait.normal"
-            android:resource="@drawable/icon" />
+                   android:resource="@mipmap/ic_launcher" />
         <meta-data android:name="com.sec.minimode.icon.landscape.normal"
-            android:resource="@drawable/icon" />
+                   android:resource="@mipmap/ic_launcher" />
 
     </activity-alias>
 

res/drawable-v26/icon.xml

@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@color/signal_primary"/>
-    <foreground android:drawable="@drawable/icon_transparent"/>
-</adaptive-icon>

res/xml/contactsformat.xml

@@ -1,13 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ContactsSource xmlns:android="http://schemas.android.com/apk/res/android">
     <ContactsDataKind
-            android:icon="@drawable/icon"
+            android:icon="@mipmap/ic_launcher"
             android:mimeType="vnd.android.cursor.item/vnd.org.thoughtcrime.securesms.contact"
             android:summaryColumn="data2"
             android:detailColumn="data3"
             android:detailSocialSummary="true"/>
     <ContactsDataKind
-            android:icon="@drawable/icon"
+            android:icon="@mipmap/ic_launcher"
             android:mimeType="vnd.android.cursor.item/vnd.org.thoughtcrime.securesms.call"
             android:summaryColumn="data2"
             android:detailColumn="data3"/>