Fixing HTTPS issues with map contacts function

With mapping of contacts the organisation that I am part of has found some issues where browsers my block the map showing when a user goes to map contacts or click on the map icon for an address. This is mainly due to the fact that the map renders in http and we have all civi urls in https so browsers don't show the unsecured content.

The probable solution is to change the url in line 35 of google.tpl from // to $_SERVER['SERVER_PROTOCOL']. This would mean that civi would load the map based on what the server protocol is.