Remove superfluous call in wxTranslations::LoadCatalog().

This call to GetAvailableTranslations() did nothing, it's value was
ignored, and it was done before m_loader was checked for != NULL.
Probably some leftover debugging code.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74246 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775