tests: qemuhotplug: Remove unused test macro DO_TEST_DETACH_EVENT
tests: qemuhotplug: Remove unused test macro DO_TEST_DETACH_EVENT

This variant is unused as we create the object including capabilities
with DO_TEST_ATTACH_EVENT, which is then reused.

Signed-off-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>

jardasgit/libvirt,olafhering/libvirt,fabianfreyer/libvirt,crobinso/libvirt,nertpinx/libvirt,olafhering/libvirt,jardasgit/libvirt,olafhering/libvirt,jardasgit/libvirt,andreabolognani/libvirt,olafhering/libvirt,zippy2/libvirt,eskultety/libvirt,zippy2/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,libvirt/libvirt,jardasgit/libvirt,jardasgit/libvirt,andreabolognani/libvirt,eskultety/libvirt,jfehlig/libvirt,libvirt/libvirt,crobinso/libvirt,nertpinx/libvirt,crobinso/libvirt,zippy2/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,nertpinx/libvirt,libvirt/libvirt,andreabolognani/libvirt,eskultety/libvirt,crobinso/libvirt,jfehlig/libvirt,nertpinx/libvirt,zippy2/libvirt,eskultety/libvirt,fabianfreyer/libvirt,eskultety/libvirt,libvirt/libvirt