Added grandparent.resize_children() in Terminator.remove()

to force the terminal term to have the right size when returning
 otherwise, resizing is delayed and dnd between 2 siblings will
 squeeze a term

terminator

@@ -879,6 +879,7 @@ class Terminator:
       parent.remove(widget.get_box())
       grandparent.remove (parent)
       sibling.reparent (grandparent)
+      grandparent.resize_children()
       parent.destroy ()
       self.term_list.remove (widget)