Icon for unified inbox

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

@@ -83,7 +83,10 @@ public class AdapterNavUnified extends RecyclerView.Adapter<AdapterNavUnified.Vi
         }
 
         private void bindTo(TupleFolderUnified folder) {
-            ivItem.setImageResource(EntityFolder.getIcon(folder.type));
+            if (EntityFolder.INBOX.equals(folder.type))
+                ivItem.setImageResource(R.drawable.baseline_all_inbox_24);
+            else
+                ivItem.setImageResource(EntityFolder.getIcon(folder.type));
 
             long count;
             if (EntityFolder.DRAFTS.equals(folder.type))

app/src/main/res/drawable/baseline_all_inbox_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="M19,3L5,3c-1.1,0 -2,0.9 -2,2v7c0,1.1 0.9,2 2,2h14c1.1,0 2,-0.9 2,-2L21,5c0,-1.1 -0.9,-2 -2,-2zM19,9h-4c0,1.62 -1.38,3 -3,3s-3,-1.38 -3,-3L5,9L5,5h14v4zM15,16h6v3c0,1.1 -0.9,2 -2,2L5,21c-1.1,0 -2,-0.9 -2,-2v-3h6c0,1.66 1.34,3 3,3s3,-1.34 3,-3z"/>
+</vector>