Revert "Do not disable HAML options validation" [SKIP REVIEW APP]

Chad Woolleyrequested to merge
revert-6d2902dd into master

What does this MR do?

Actually haml options validation disable does do stuff, like preventing these:

Haml::TempleEngine: Option :lang is invalid
Haml::TempleEngine: Option :locale is invalid

Related issues

Relates #6689 (closed)

Edited by Chad Woolley

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