Remove non-existent test decorator

`@symlink_test` skip tests on wasm, where symlinks behave inconsistently.
Python 3.10 doesn't do wasm and doesn't have the decorator.

Lib/test/test_tarfile.py

@@ -3591,7 +3591,6 @@ def test_sly_relative2(self):
                     + """['"].*moo['"], which is outside the """
                     + "destination")
 
-    @symlink_test
     def test_deep_symlink(self):
         # Test that symlinks and hardlinks inside a directory
         # point to the correct file (`target` of size 3).
@@ -3615,7 +3614,6 @@ def test_deep_symlink(self):
                 else:
                     self.expect_file('linkdir/symlink', size=3)
 
-    @symlink_test
     def test_chains(self):
         # Test chaining of symlinks/hardlinks.
         # Symlinks are created before the files they point to.