Do not load product when it is already loaded

[luigifab]

Description

When review/form block is added to the product page, without this PR, the product is loaded a second time.

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All automated tests passed successfully (all builds are green)

[github-actions]

Unit Test Results

1 files  ±0  1 suites  ±0   0s ⏱️ ±0s
0 tests ±0  0 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
6 runs  ±0  4 ✔️ ±0  2 💤 ±0  0 ❌ ±0 

Results for commit 1f0779e. ± Comparison against base commit 94563c7.

[luigifab]

I noticed that ($product->getId() == $this->getRequest()->getParam('id')) doesn't work with Turpentine+Varnish, because esi URL doesn't contain the id parameter. Simple solution: remove it.