updateDestinationSelectionList() allocated a MeshPacket via
allocDataPacket() that was never sent or released, permanently
consuming one packetPool slot every time the destination-selection
picker was rebuilt.
On non-PSRAM targets packetPool is a static 70-slot BSS pool, so
repeated picker use exhausts it and eventually blocks all packet
allocation (TX/RX failures). On PSRAM/portduino (MemoryDynamic)
targets it is a true heap leak of ~424B per rebuild.
The allocation and its two field writes (pki_encrypted, channel) were
a copy/paste artifact of the PKI setup in sendText() and had no effect
in this function. Remove the dead allocation.
Ben Meadors
f7fd058308