Updated foreground service icon

app/src/main/java/eu/faircode/email/ServiceSynchronize.java

@@ -248,7 +248,7 @@ public class ServiceSynchronize extends LifecycleService {
             builder = new Notification.Builder(this);
 
         builder
-                .setSmallIcon(R.drawable.baseline_mail_outline_24)
+                .setSmallIcon(R.drawable.baseline_compare_arrows_24)
                 .setContentTitle(getResources().getQuantityString(R.plurals.title_notification_synchronizing, accounts, accounts))
                 .setContentIntent(pi)
                 .setAutoCancel(false)

app/src/main/res/drawable/baseline_compare_arrows_24.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0"
+        android:tint="?attr/colorControlNormal">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M9.01,14L2,14v2h7.01v3L13,15l-3.99,-4v3zM14.99,13v-3L22,10L22,8h-7.01L14.99,5L11,9l3.99,4z"/>
+</vector>