maliit-framework: fix build with glib 2.36

Upstream code has seen many structural changes and the failing test is gone.
Since changing to latest sources might cause huge reworking/test-efforts this
patch only fixes the build error.

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>