Bug 1684584: do not encode `topobjdir` before printing to screen during clobber r=firefox-build-system-reviewers,mhentges

Since the printed value is a `str` anyways, this causes the converted `bytes`
to be printed to the terminal as `b'/path/to/topobjdir'`. Just print the `str`
version to the screen instead.

Differential Revision: https://phabricator.services.mozilla.com/D100792

python/mozbuild/mozbuild/controller/clobber.py

@@ -228,8 +228,7 @@ class Clobberer(object):
                 ),
             )
 
-        objdir = self.topobjdir.encode("utf-8", "replace")
-        print("Automatically clobbering %s" % objdir, file=fh)
+        print("Automatically clobbering %s" % self.topobjdir, file=fh)
         try:
             self.remove_objdir(False)
             print("Successfully completed auto clobber.", file=fh)