feat(ffi): Warning instead of error if dc_get_msg() could not retriev…

…e message

As trashed messages can't be loaded from the db now by `Message::load_from_db()` returning an error
for such messages, errors from `Message::load_from_db()` should be logged as warnings. If it's
really an error like a db failure, it should be logged internally.

deltachat-ffi/src/lib.rs

@@ -2000,7 +2000,7 @@ pub unsafe extern "C" fn dc_get_msg(context: *mut dc_context_t, msg_id: u32) ->
                     );
                     message::Message::default()
                 } else {
-                    error!(ctx, "dc_get_msg could not retrieve msg_id {msg_id}: {e:#}");
+                    warn!(ctx, "dc_get_msg could not retrieve msg_id {msg_id}: {e:#}");
                     return ptr::null_mut();
                 }
             }