[core] Remove unnecessary OVT path adjustments

Not only does this not work (path.join() will not
actually add Z: on non-Windows), it's also not necessary.

Confirmed to work with Detroit: Become Human (Demo) and
Just Cause 4.

legendary/core.py

@@ -247,9 +247,6 @@ class LegendaryCore:
                                     f'{game.asset_info.namespace}{game.asset_info.catalog_item_id}.ovt')
             with open(ovt_path, 'wb') as f:
                 f.write(ovt)
-            # To access the OVT from WINE we have have to prepend Z: to the path
-            if os.name != 'nt':
-                ovt_path = os.path.join('Z:', ovt_path)
             params.append(f'-epicovt={ovt_path}')
 
         params.extend([