Unnecessary c_str call in WII_IPC_HLE_Device_es.cpp's OpenTitleContent function.

m_ContentFile is a string, so it's kind of pointless to pass a c_str of a string to constructor of a new string.
Merge pull request #106 from lioncash/unnecessary-cstr

Unnecessary c_str() call in WII_IPC_HLE_Device_es.cpp's OpenTitleContent function.