libostree.sym: Fix test-symbols
libostree.sym: Fix test-symbols

The test isn't smart enough to ignore comments, so change the prefix.

Closes: #356
Approved by: jlebon

GNOME/ostree,gatispaeglis/ostree,gatispaeglis/ostree,gatispaeglis/ostree,GNOME/ostree,GNOME/ostree,gatispaeglis/ostree,GNOME/ostree,GNOME/ostree,gatispaeglis/ostree,gatispaeglis/ostree