Unswap names of parameters for unwind_destructor_stack

The names of the parameters of `unwind_destructor_stack` were the
opposite way round in the header from the `.cpp`. The order in the
`.cpp` is the actual order as it is currently implemented. So by
(un)swapping the order in the header the names are made consistent.

Author: thomasspriggs

src/goto-programs/goto_convert_class.h

@@ -360,8 +360,8 @@ class goto_convertt:public messaget
     const source_locationt &source_location,
     goto_programt &dest,
     const irep_idt &mode,
-    optionalt<node_indext> destructor_start_point = {},
-    optionalt<node_indext> destructor_end_point = {});
+    optionalt<node_indext> destructor_end_point = {},
+    optionalt<node_indext> destructor_start_point = {});
 
   void build_declaration_hops(
     goto_programt &dest,