Was a problem with the old delete button being an image and so passed
the _x value, which was then checked for.

Changed it so it checks that the submit param exists, which is more
robust

behatnotneeded : problem of finding the row that you just deleted as
all deleted rows have the same 'Comment removed by the author' text

Change-Id: Iea379badd2d364112d107977b8f53a62ac272428
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>