scrypted: auto-restart ffmpeg if it exits while the stream timer is alive

Cameras occasionally drop their H.264 stream mid-event — RTSP source
rotation, brief network glitch, etc. ffmpeg exits clean and the script
previously logged the exit and stopped feeding /frame, leaving the
panel stuck on the last successful frame until the next camera event
fired a fresh startStream.

Restructure the spawn into a closure-captured spawnFfmpeg() that the
on('close') handler can call again. Rolling restart cap of 5 per 60 s
prevents tight loops if the source is genuinely down.

On clean exit during an active stream: log + setTimeout(spawnFfmpeg, 250).
On too-many restarts: log a warning, stopStream, wait for the next
camera event.

The streams map no longer stores the ffmpeg proc (it changes across
restarts); abort.signal kills whatever's current via its listener.

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