Fix a compiler problem when building 'gtk2_ardour/template_dialog.cc' with MSVC

Fix a compiler problem when building 'gtk2_ardour/template_dialog.cc' with MSVC

When setting up the 'TemplatesImported' signal, these 2 calls appear in the c'tor for class TemplateDialog:-

	boost::bind (&RouteTemplateManager::init, route_tm)
	boost::bind (&SessionTemplateManager::init, session_tm)

However - '&RouteTemplateManager::init' and '&SessionTemplateManager::init' are in fact the address of the same function. This seems to be causing a problem, either for boost::bind, or MSVC (or both).

In earlier builds they were 2 separate functions. So let's put them back that way (since the current code actually crashes the compiler!!)