fix minor issue, can not get correct sorted column when throw sored e…

[bxf12315]

…vent

[bxf12315]

@cristianonicolai I test it, I find a issue when throw sorted column event and ColumnSortedList's size more than 2, sorted column always is null.

[cristianonicolai]

@bxf12315 I added the check because we only sort by one column at time, what is the case for having a size of 2?

[bxf12315]

@cristianonicolai when you click CreateOn (Or other column) more than twice, ColumnSortList's size will more than 2.

[bxf12315]

@cristianonicolai I add "newListGrid.getColumnSortList().setLimit(1);" in method loadListTable. It is work. but I can't find the necessity of the code. I think just remove "check size less 1 " is enough.
I also remove code https://github.com/cristianonicolai/jbpm-wb/pull/40/files#diff-a5485d38408578707c1e8179af4297ffL562