Fix groupcall debug info in rageshakes

We were putting the whole array from setState in, so the debug info
was wrapped in an array when it shouldn't be.

Also comment the groupCallInspector setState/context dance which I
now *finally* understand.

src/room/GroupCallInspector.tsx

@@ -121,8 +121,11 @@ export function InspectorContextProvider({
 }: {
   children: React.ReactNode;
 }) {
-  // The context will be initialized empty.
-  // It is then set from within GroupCallInspector.
+  // We take the tuple of [currentState, setter] and stick
+  // it straight into the context for other things to call
+  // the setState method... this feels like a fairly severe
+  // contortion of the hooks API - is this really the best way
+  // to do this?
   const context = useState<InspectorContextState>({});
   return (
     <InspectorContext.Provider value={context}>

src/settings/submit-rageshake.ts

@@ -40,7 +40,9 @@ export function useSubmitRageshake(): {
   error: Error;
 } {
   const client: MatrixClient = useClient().client;
-  const json = useContext(InspectorContext);
+  // The value of the context is the whole tuple returned from setState,
+  // so we just want the current state.
+  const [inspectorState] = useContext(InspectorContext);
 
   const [{ sending, sent, error }, setState] = useState({
     sending: false,
@@ -231,10 +233,12 @@ export function useSubmitRageshake(): {
             body.append("compressed-log", new Blob([buf]), entry.id);
           }
 
-          if (json) {
+          if (inspectorState) {
             body.append(
               "file",
-              new Blob([JSON.stringify(json)], { type: "text/plain" }),
+              new Blob([JSON.stringify(inspectorState)], {
+                type: "text/plain",
+              }),
               "groupcall.txt"
             );
           }
@@ -262,7 +266,7 @@ export function useSubmitRageshake(): {
         console.error(error);
       }
     },
-    [client, json, sending]
+    [client, inspectorState, sending]
   );
 
   return {