fix(icom): say when a radio has no scope stream instead of drawing nothing

The CI-V trace settles it: the IC-7851 answers 27 10 01 with FB and 27 14 00
with its mode, but refuses 27 11 in BOTH shapes — it controls its scope over
CI-V and never streams it. Its last firmware is from 2016, older than the
waveform stream itself; Hamlib's caps claim otherwise, the radio is the
authority.

Rejected both ways is a permanent answer, so it is remembered and reported:
the panadapter says the radio does not send its scope, which is the one thing a
black rectangle could not say.

frontend/wailsjs/go/models.ts

@@ -1196,6 +1196,7 @@ export namespace cat {
 	    low_hz: number;
 	    high_hz: number;
 	    fixed: boolean;
+	    unsupported: boolean;
 	
 	    static createFrom(source: any = {}) {
 	        return new ScopeSweep(source);
@@ -1208,6 +1209,7 @@ export namespace cat {
 	        this.low_hz = source["low_hz"];
 	        this.high_hz = source["high_hz"];
 	        this.fixed = source["fixed"];
+	        this.unsupported = source["unsupported"];
 	    }
 	}
 	export class TCIPanelState {