Reposition remove button

The remove button animation was taking the send button out of its
current place. This was pretty annoying when adding more sticker.

Signed-off-by: Mailson Menezes <mailson@gmail.com>
Database: add batch insertion and clear methods

Those methods were added to use along the migration tool. We need a way
to clear the current database and insert elements in batch.

Signed-off-by: Mailson Menezes <mailson@gmail.com>