closes wrong editors

Use actual element on which the "close" menu was triggered instead of
the selection computed from the table. Latter one can change on mouse
move by AbstractTableInformationControl before the actual close handler
is executed.

Change-Id: Idc014ad4e3b42166c49a514a0c0615b3a5a880aa
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>