When Real time map is loaded over https, it does not always load the SVG files over ssl

[mattab]

reported in forums

When Piwik is used over HTTPS, we should load the SVG files over HTTPS or the browser will simply not load them.

Saw: Map not showing

Expected: map should show over HTTPS

[mattab]

In 4924334: Refs #4926 when loaded over HTTPS, make the sure PiwikUrl is https (even though it may be cached as HTTP)

[mattab]

Verified that it works on the demo in 2.1.1-b9!