fdo#71784:Preserve prop "allow row to break across pages" during export

Description:
If in original doc for table if "allow row to break across pages" is checked then during export
it used to write <w:cantSplit w:val="false"/> in trPr which was causing problem that all the cell
data was getting displayed on same page.

Change-Id: I5a20976ca91099de191eb1e2a7290b96dcdc6777
convert show extension licence dialog to .ui

Change-Id: I0e34a0ddaee1485184b55788d618288f4e3f69cb