enableDataDogProfiler() err check is wrong

[R-Santev]

enableDataDogProfiler() err check is wrong

Description

A wrong variable is checked for error is made in server/server.go:175

Your environment

• OS and version.
  Irrelevant.
• The version of the Polygon Edge.
  Version 1.3.3
• The branch that causes this issue.
  develop
• Locally or Cloud hosted (which provider).
  Irrelevant.
• Please confirm if the validators are running under containerized environment (K8s, Docker, etc.).
  Irrelevant.

Expected behavior

• Tell us what should happen.
  " DataDog profiler setup failed" must be logged when ddErr is != nil
• Tell us what happened instead.
  It doesn't enter the if statement

Proposed solution

I am attaching a PR resolving the issue: #2200