Fix "Mark as Sensitive by default" locking files into a Sensitive state

What does this PR do? (Please give us a brief description of what this PR does.)

This fixes an issue caused by changing alwaysMarkNsfw to be what the boolean calls it way back about a year ago forcing users files to be stuck as sensitive when toggled by admins/mods.

This unfortunately had the side-effect of breaking the Mark as Sensitive by default option in settings/drive which also relied on the same boolean to fix this I simply add a new boolean specifically for that toggle.

(This issue does not affect remote users only local)

Closes #760 (closed)

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