Improve randomString mock for better snapshots (#11375)

test/components/views/settings/devices/FilteredDeviceListHeader-test.tsx

@@ -19,11 +19,6 @@ import React from "react";
 
 import FilteredDeviceListHeader from "../../../../../src/components/views/settings/devices/FilteredDeviceListHeader";
 
-// Fake random strings to give a predictable snapshot for IDs
-jest.mock("matrix-js-sdk/src/randomstring", () => ({
-    randomString: () => "abdefghi",
-}));
-
 describe("<FilteredDeviceListHeader />", () => {
     const defaultProps = {
         selectedDeviceCount: 0,

test/components/views/settings/devices/__snapshots__/FilteredDeviceListHeader-test.tsx.snap

@@ -7,7 +7,7 @@ exports[`<FilteredDeviceListHeader /> renders correctly when all devices are sel
     data-testid="test123"
   >
     <div
-      aria-describedby="mx_TooltipTarget_abdefghi"
+      aria-describedby="mx_TooltipTarget_vY7Q4uEh"
       tabindex="0"
     >
       <span
@@ -52,7 +52,7 @@ exports[`<FilteredDeviceListHeader /> renders correctly when no devices are sele
     data-testid="test123"
   >
     <div
-      aria-describedby="mx_TooltipTarget_abdefghi"
+      aria-describedby="mx_TooltipTarget_vY7Q4uEh"
       tabindex="0"
     >
       <span