popup.js and possible other modules wrong check of svg support

[Avivonz]

#3175 In popup.js line 418, it checks :
return (typeof SVGGraphicsElement === 'undefined');

And says it supports it if it returns true, while it will obviously return false, because it does exist.

Fix :
return (typeof SVGGraphicsElement !== 'undefined');

[GuacheSuede]

#6109

[stale]

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