Correct various meta viewport tags

Correct various meta viewport tags

I don't know where this cargo cult started, but the semicolon
separator was just wrong, (should be a comma), and the
maximum-scale=1.0 and user-scalable=0 were really just rude, (if a
user needs to/wants to zoom in on a page for accessibility purposes,
who are we to say they can't or shouldn't?).