Retire vestigial pskreporter binary checks

[mijahauan]

Small cleanup surfaced by the requirements baseline. After the move to hs-uploader's PskReporterTcp transport (no external pskreporter binary), two clients still carry a vestigial /usr/local/bin/pskreporter presence check in their validate/config paths:

• psk-recorder — PSK-F-092
• meteor-scatter — MTS-F-095

Remove the dead check so validate doesn't warn on a binary that's no longer on the upload path.