Remove unneeded bind accelerator parameter

Because this is an method on the instance of the unlocked_database instance so passing it in as a parameter of this funtion is redundant. Found by looking at why pylint complained about no usage of "self." in an instance method. Adapt all 3 users of this function and it makes us hand around less stuff.

The pylint score is somewhat decreased because UnlockedDatabase.init() is now annotated and pylint can perform more checks.