GCI Folder: correctly identify region of sysmenu

JMC47  identified that the wii system menu region was not correctly identified, this correctly identifies the region for the special case of the sysmenu,
gc/wii disc/wiiware/vc are all correctly identified by the original
homebrew will always use europe as is done everywhere else
What does this string represent? Maybe put it as a const variable so it's more descriptive.