[Autofill] Fixed captured-site tests therealreal and zenni_optical.

The tests were failing for different reasons:
- therealreal was failing because there were duplicate Autofill actions.
  This was broken by crrev.com/c/3031944 where I accidentally
  copy-pasted an action. For some reason, the second action did succeed
  locally, but not on the bot.
- zenni_optical was failing because of JavaScript changing the filled
  value. This was broken by crrev.com/c/3046020. While I do not
  understand how the culprit CL affected this, I did not investigate
  much since this behaviour has changed back and forth in the past and
  it's not a regression.

zenni_optical.test
124c124
<       "expectedValue": "AUSTIN",
---
>       "expectedValue": "Austin",

therealreal.test
291,303d290
<       "selector": "//input[@type=\"tel\"]",
<       "context": {
<         "isIframe": true,
<         "browserTest": {
<           "name": "braintree-hosted-field-number"
<         },
<         "path": []
<       },
<       "type": "autofill",
<       "visibility": 2,
<       "action_index": 21
<     },
<     {

Bug: 1236798, 1236799
Change-Id: Ia50d6b76223e98d62e92db300fa513d7e3fcfbf5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3071187


Reviewed-by: Ian Struiksma <ianstruiksma@google.com>
Commit-Queue: Christoph Schwering <schwering@google.com>
Cr-Commit-Position: refs/heads/master@{#908716}