graft: fix --base value to be saved in state file

'True' just works because it is treated as an integer revision '1' and
only the truthiness of the basectx is important. If multiple source revisions
were supported with --base, the resumed graft operation would go wrong.

mercurial/commands.py

@@ -3168,7 +3168,7 b' def _dograft(ui, repo, *revs, **opts):'
     if opts.get(b'no_commit'):
         statedata[b'no_commit'] = True
     if opts.get(b'base'):
-        statedata[b'base'] = True
+        statedata[b'base'] = opts[b'base']
     for pos, ctx in enumerate(repo.set(b"%ld", revs)):
         desc = b'%d:%s "%s"' % (
             ctx.rev(),