elc_filselector: solve the mysterium of sometimes failing tests

elc_filselector: solve the mysterium of sometimes failing tests

so after a phone call, two days of debugging, tears, crying etc. etc. we
finally came to a point of enlightenment! *Someone* (bu5hm4n) moved
gengrid and genlist events from eo back to smart events, so we can work
arround legacy borks and event-name collisions, at this point he did not
knew that some widgets (fileselector) already relied on those *lovely*
events. Hence this broke theoretically the testsuite, however, the
fileselector testsuite is ultimatily buggy, and the wait function does
not return false when it timeouts, (i don't know why not). So this break
was never discovered.

Additionally there is a second issue. it appears, that when we
immidiatly quit the mainloop after we have got the selected callback,
that then genlist decides to forget about the sd->selected pointer, and
NULLs that one out. Which then results in the fact that
elm_fileselector_selected_get ends up returning invalid paths.

Reviewed-by: Cedric BAIL <cedric.bail@free.fr>
Differential Revision: https://phab.enlightenment.org/D8488