Remove the option to show non-member ("ghost") participants

As we'd like to get the multi-SFU feature branch shipped, this is not the most important debugging tool to expend effort on at the moment.

src/state/CallViewModel.test.ts

@@ -69,7 +69,6 @@ import {
 } from "../livekit/useECConnectionState";
 import { E2eeType } from "../e2ee/e2eeType";
 import type { RaisedHandInfo } from "../reactions";
-import { showNonMemberTiles } from "../settings/settings";
 import {
   alice,
   aliceDoppelganger,
@@ -824,53 +823,6 @@ test("participants must have a MatrixRTCSession to be visible", () => {
   });
 });
 
-test("shows participants without MatrixRTCSession when enabled in settings", () => {
-  try {
-    // enable the setting:
-    showNonMemberTiles.setValue(true);
-    withTestScheduler(({ behavior, expectObservable }) => {
-      const scenarioInputMarbles = " abc";
-      const expectedLayoutMarbles = "abc";
-
-      withCallViewModel(
-        {
-          remoteParticipants$: behavior(scenarioInputMarbles, {
-            a: [],
-            b: [aliceParticipant],
-            c: [aliceParticipant, bobParticipant],
-          }),
-          rtcMembers$: constant([localRtcMember]), // No one else joins the MatrixRTC session
-        },
-        (vm) => {
-          vm.setGridMode("grid");
-          expectObservable(summarizeLayout$(vm.layout$)).toBe(
-            expectedLayoutMarbles,
-            {
-              a: {
-                type: "grid",
-                spotlight: undefined,
-                grid: ["local:0"],
-              },
-              b: {
-                type: "one-on-one",
-                local: "local:0",
-                remote: `${aliceId}:0`,
-              },
-              c: {
-                type: "grid",
-                spotlight: undefined,
-                grid: ["local:0", `${aliceId}:0`, `${bobId}:0`],
-              },
-            },
-          );
-        },
-      );
-    });
-  } finally {
-    showNonMemberTiles.setValue(showNonMemberTiles.defaultValue);
-  }
-});
-
 it("should show at least one tile per MatrixRTCSession", () => {
   withTestScheduler(({ behavior, expectObservable }) => {
     // iterate through some combinations of MatrixRTC memberships