[FIXED] Invalidate stream state on read/write if tracking states mismatch

[MauriceVanVeen]

• When writing the state file, the state check was not active anymore. That change was made here.
• When reading the state file, the state check was removed as well which meant if all checksums matched we'd use a stale index.db. Re-introduced the state check from here.

Signed-off-by: Maurice van Veen github@mauricevanveen.com