Remove leftover debug print

[mk0walsk]

Removes an accidental fmt.Println call in putPrecomputedKeysNonBatched.

This appears to be a leftover debug statement that:

1. Pollutes stdout with raw byte data during execution.
2. Bypasses the structured logger (s.logger) used elsewhere in the file.
3. Adds unnecessary I/O overhead inside a loop.

[D4ryl00]

Good catch, thanks.