cheese-viewport.json: replace single quotes with double (#183)

Adam Williamsonrequested to merge
adamw/cheese:fix-json-quotes into master

single quotes are not strictly valid JSON. It seems something - I think clutter - is validating this more strictly than before, as it's suddenly started causing Cheese to crash on startup.

Signed-off-by: Adam Williamson awilliam@redhat.com

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