fdb_destroy does not delete database with numeric suffix (manual compaction)

fdb_compact doesn't seem to handle the case where there is a manually-compacted database with a numeric suffix (which can happen if the database is not properly closed after compaction.)

Steps to reproduce, as summarized by Sundar in email:

• Compact "fileA" in place with NULL as new filename (creates numeric suffix "fileA.1")
• Exit the application without calling fdb_close()
• Directly call fdb_destroy("fileA")

Result:

• "fileA.1" is still present in the system.

Expected Result:

• "fileA.1" is deleted