sidedata: register copies sidedata computer regardless of the revlog version

Repositories should not gate their sidedata computers based on any requirement,
only their wanted sidedata. A repository might need to generate sidedata wanted
by the peer that it itself does not want.

Differential Revision: https://phab.mercurial-scm.org/D10340

mercurial/metadata.py

@@ -826,12 +826,12 b' def copies_sidedata_computer(repo, revlo'
 def set_sidedata_spec_for_repo(repo):
     if requirementsmod.COPIESSDC_REQUIREMENT in repo.requirements:
         repo.register_wanted_sidedata(sidedatamod.SD_FILES)
-        repo.register_sidedata_computer(
-            revlogconst.KIND_CHANGELOG,
-            sidedatamod.SD_FILES,
-            (sidedatamod.SD_FILES,),
-            copies_sidedata_computer,
-        )
+    repo.register_sidedata_computer(
+        revlogconst.KIND_CHANGELOG,
+        sidedatamod.SD_FILES,
+        (sidedatamod.SD_FILES,),
+        copies_sidedata_computer,
+    )
 
 
 def getsidedataadder(srcrepo, destrepo):