Refactor endpoints initialization for Browser component

[zeezo887]

Description

This change aims to fix the initialization of the endpoints property when passed to the Browser component. Initially, we have

$this->endpoints = $this->endpoints === [] ? $endpointsFromModules ?? [] : [];

which always sets $endpoints to an empty array when a value is passed. The changes made here includes

• Removed the extra variable $endpointsFromModules, simplifying the assignment.
• and only re-assigning the $endpoints property if it is empty and if $this->modules exists.

Related Issues

Fixes #2717