Allow deleting DETACH operations

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

@@ -123,6 +123,7 @@ public class FragmentDialogOperationsDelete extends FragmentDialogBase {
                                         addAll(ops, db.operation().getOperations(EntityOperation.DELETE));
                                         addAll(ops, db.operation().getOperations(EntityOperation.PURGE));
                                         addAll(ops, db.operation().getOperations(EntityOperation.EXPUNGE));
+                                        addAll(ops, db.operation().getOperations(EntityOperation.DETACH));
                                     }
 
                                     for (EntityOperation op : ops) {

app/src/main/res/layout/dialog_delete_operations.xml

@@ -118,7 +118,7 @@
             android:layout_height="wrap_content"
             android:layout_marginStart="48dp"
             android:fontFamily="monospace"
-            android:text="DELETE, PURGE, EXPUNGE"
+            android:text="DELETE, PURGE, EXPUNGE, DETACH"
             android:textAppearance="@style/TextAppearance.AppCompat.Small"
             android:textSize="12sp"
             app:layout_constraintEnd_toEndOf="parent"