Don't reset the package localpath to temporary after download (RhBug:1757613)

The path is already changed from temporary to final earlier in the
function, as the file is renamed. The removed line seems superfluous and
out of place, the value in po.localpath should already be the correct
one.

https://bugzilla.redhat.com/show_bug.cgi?id=1757613

Author: Lukáš Hrázký

yum/__init__.py

@@ -2583,7 +2583,6 @@ def checkfunc(obj, po=po):
                         result, errmsg = self.sigCheckPkg(po)
                         if result != 0:
                             self.verbose_logger.warn("%s", errmsg)
-                    po.localpath = obj.filename
                     if po in errors:
                         del errors[po]