Allow enabling answers/rules from list

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

@@ -59,6 +59,9 @@ public interface DaoRule {
     @Update
     int updateRule(EntityRule rule);
 
+    @Query("UPDATE rule SET enabled = :enabled WHERE id = :id")
+    int setRuleEnabled(long id, boolean enabled);
+
     @Query("DELETE FROM rule WHERE id = :id")
     void deleteRule(long id);
 }