fix(motor-antenna): don't inhibit TX on a band the antenna doesn't cover

The follow filter correctly leaves the antenna put on an un-ticked band, but the
TX-inhibit loop ran independently: it gagged FlexRadio transmit whenever the
antenna reported "moving" (a stray polled Moving flag, or a move finishing from
the previous band), even on a band OpsLog was deliberately not managing. An
operator working 15 m on another antenna had their FT8 cut mid-transmission by
an "antenna moving" interlock.

motorTXInhibitLoop now takes the covered-band set and forces moving=false when
the current rig band isn't in it — un-ticking a band means hands off entirely:
no tune AND no inhibit. Also correct the RCU-01 references to RCU-06 (the actual
controller behind the short 11-byte status frame).

internal/ultrabeam/ultrabeam.go

@@ -509,7 +509,7 @@ func (c *Client) queryStatus() (*Status, error) {
 		return nil, err
 	}
 
-	// An older controller — seen behind an RS232-to-Ethernet bridge — answers with
+	// An RCU-06 controller — seen behind an RS232-to-Ethernet bridge — answers with
 	// an 11-byte status frame: the standard one WITHOUT the trailing FreqMax byte.
 	// The packet checksum was already verified, so a short-but-valid frame is real,
 	// not a fragment. Accept it and default the missing tail fields instead of