ITHC fix headers for admin #5763
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This adds the headers
X-Content-Type-Options: X-Content-Type-Options: nosniff
Strict-Transport-Security: Strict-Transport-Security: max-age=31536000; includeSubDomains
Cache-control: Cache-control: no-store / Pragma: no-cache
X-Frame-Options: X-Frame-Options: DENY / X-Frame-Options: SAMEORIGIN
X-Permitted-Cross-Domain-Policies: X-Permitted-Cross-Domain-Policies: none
It removes
X-Xss-Protection: 1; mode=block
I've checked it locally for email branding in safari, firefox and chome.