GVfsJobUnmount: Fix debug messages line endings
GVfsJobUnmount: Fix debug messages line endings

g_debug() needs explicit line endings ("\n")

gicmo/gvfs,xkahn/gvfs-cmis,halfline/gvfs,xkahn/gvfs-cmis,gicmo/gvfs,xkahn/gvfs-cmis,gicmo/gvfs,halfline/gvfs,xkahn/gvfs-cmis,gicmo/gvfs,halfline/gvfs