Fix e2e shield being invisible in white mode for encrypted room (#30408)

* fix: e2e icon for encrypted room

* test(e2e): add screenshot for grey shield in encrypted room

playwright/e2e/crypto/crypto.spec.ts

@@ -158,6 +158,8 @@ test.describe("Cryptography", function () {
             await page.getByRole("textbox", { name: "Send a message…" }).press("Enter");
             await checkDMRoom(page);
             const bobRoomId = await bobJoin(page, bob);
+            await expect(page.locator(".mx_MessageComposer_e2eIcon")).toMatchScreenshot("composer-e2e-icon-normal.png");
+
             await testMessages(page, bob, bobRoomId);
             await verify(app, bob);