Flush queued pointer writes when flush()ing

yama/src/pile/local_sqlitebloblogs.rs

@@ -532,6 +532,9 @@ impl RawPile for SqliteBloblogPile {
             .writers_reach_zero
             .wait_while(inner, |inner| inner.writers_in_progress != 0)
             .unwrap();
+
+        self.flush_queued_pointer_writes()?;
+
         // TODO sync all files we have open first!
         sync();
         Ok(())