fix fetch post inside lock functions

[Mh-Asmi]

This pull request makes the following changes:

Test checklist:

• [ ]

• I certify that I ran my checklist

Fixes ushahidi/platform# .

Ping @ushahidi/platform

[linear]

USH-1540 Multiple Post Locks Created for Single Post

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ Ushahidi\Core\Exception\NotFoundException: Post not found Ushahidi\Modules\V5\Http\Controllers\PostContro... View Issue

_{Did you find this useful? React with a 👍 or 👎}