monitor: Do not allow TachSensor move

TachSensor uses the this pointer as the systemd callback
context for signal callbacks, which doesn't work with
move semantics.

Change-Id: I5e58fec9a7edfc457103d8a36f6076d90246f4f0
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
1 file changed