manifest: fix ManifestProject __repr__

There's no reason to print the name; it's always "manifest".

And even if we were going to print the name, it should have been
quoted, so anyway this behavior is wrong.

Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>

src/west/manifest.py

@@ -994,7 +994,7 @@ class ManifestProject(Project):
     '''
 
     def __repr__(self):
-        return (f'ManifestProject({self.name}, path={repr(self.path)}, '
+        return (f'ManifestProject(path={repr(self.path)}, '
                 f'west_commands={self.west_commands}, '
                 f'topdir={repr(self.topdir)})')