Embind: No need for $query

...to "upcast" from css::uno::Reference<T> to base
css::uno::Reference<css::uno::XInterface>.  My understanding now is that due to
the sharing_policy::INTRUSIVE we specify for
emscripten::smart_ptr_trait<css::uno::Reference<T>>
(include/static/unoembindhelpers/PrimaryBindings.hxx), Embind can internally
"upcast" from a css::uno::Reference<T> to a base
css::uno::Reference<css::uno::XInterface> by just treating the encapsulated raw
pointer of type T* as a raw pointer of type css::uno::XInterface* (see the use
of that sharingPolicy in genericPointerToWireType in Emscripten's
src/embind/embind.js; though documentation of that Embind sharing_policy is
rather poor).

Change-Id: I6ed60a9c94af6aba6fc6119bf644da7f507a997f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/166142
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <stephan.bergmann@allotropia.de>

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