commands: don't use dummy option declaration for properties

The property-to-option bridge (when properties change values normally
set by the command line parser) uses M_PROPERTY_GET_TYPE to get the
exact option type. In these cases, the entry in mp_properties[] is
unused, except for the name field and the property callback. Instead,
mp_property_generic_option() implements M_PROPERTY_GET_TYPE and returns
the m_option as defined in cfg-mplayer.h. However, if a property is
unavailable, mp_property_generic_option() is never actually called, and
M_PROPERTY_GET_TYPE will return the dummy option entry.

We could make sure that the dummy option entry equals the option entry
defined in cfg-mplayer.h. But this would duplicate all information.

Add a dummy option type m_option_type_dummy, which is used by entries
using the property-to-option bridge. Make M_PROPERTY_GET_TYPE fail if
this type is encountered.

This dummy should never be used, as it isn

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