Remove mjs patch of @web/test-runner-visual-regression once upstream is fixed

[melink14]

Added in #2333

@SnoozeThis modernweb-dev/web#2804 <= 1 month

[SnoozeThis]

(https://snoozeth.is/zGIfWjlAuBM) I will wait until modernweb-dev/web#2804 is closed and then reassign to you (until at most Sun, 19 Jan 2025 10:56:54 UTC).

[SnoozeThis]

The deadline passed while snoozing.

[melink14]

@SnoozeThis modernweb-dev/web#2804 <= 1 month

[SnoozeThis]

(https://snoozeth.is/B1_G1FeLgxw) I will wait until modernweb-dev/web#2804 is closed and then reassign to you (until at most Fri, 13 Jun 2025 07:47:52 UTC).

[SnoozeThis]

The deadline passed while snoozing.