[table] fix a typo when retrieving the row expand value
[table] fix a typo when retrieving the row expand value

Row expand should be read from the y_expand property, not x_expand.

jonnylamb/mx,jonnylamb/mx,pwithnall/mx,pwithnall/mx,pwithnall/mx,clutter-project/mx,clutter-project/mx,jonnylamb/mx,clutter-project/mx,clutter-project/mx,jonnylamb/mx,pwithnall/mx