SqliteDbSpec.scala: add test for binding SqlBlobs
SqliteDbSpec.scala: add test for binding SqlBlobs

This test makes sure that a blob column that is inserted as a bound
parameter is interpreted by Sqlite as a text column if it is composed of
printable characters.

meraki/scalaqlite,ongmingyang/scalaqlite,meraki/scalaqlite,meraki/scalaqlite,srhea/scalaqlite,srhea/scalaqlite,eatkins/scalaqlite,ongmingyang/scalaqlite,eatkins/scalaqlite,srhea/scalaqlite,ongmingyang/scalaqlite,eatkins/scalaqlite