Fix room settings roles tab getting confused if power level change fails (#31768)

* Fix room settings roles tab getting confused if power level change fails

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

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Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

test/unit-tests/components/views/settings/tabs/room/RolesRoomSettingsTab-test.tsx

@@ -233,6 +233,7 @@ describe("RolesRoomSettingsTab", () => {
             return null;
         });
         mocked(room.currentState.mayClientSendStateEvent).mockReturnValue(true);
+        mocked(room.getMember).mockReturnValue({ powerLevel: 100 } as any);
         const { container } = await renderTab();
 
         const selector = container.querySelector(`[placeholder="${cli.getUserId()}"]`)!;