[gnome-db] Incorrect GdaConection:is-wrapper check

[Murray Cumming <murrayc murrayc com>]

I think this commit should be reverted or improved:
https://git.gnome.org/browse/libgda/commit/libgda/gda-connection.c?id=345adb64d8bef9d998c2d687ff7d3968a627ea86

That property is set during g_object_new(), probably when setting the
default value for the property, so I (and probably anybody) see that
warning though I'm not setting the property myself.

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