configitems: register the 'server.disablefullbundle' config

mercurial/configitems.py

@@ -125,6 +125,9 b" coreconfigitem('server', 'compressioneng"
 coreconfigitem('server', 'concurrent-push-mode',
     default='strict',
 )
+coreconfigitem('server', 'disablefullbundle',
+    default=False,
+)
 coreconfigitem('ui', 'clonebundleprefers',
     default=list,
 )

mercurial/wireproto.py

@@ -842,7 +842,7 b' def getbundle(repo, proto, others):'
                               hint=bundle2requiredhint)
 
     try:
-        if repo.ui.configbool('server', 'disablefullbundle', False):
+        if repo.ui.configbool('server', 'disablefullbundle'):
             # Check to see if this is a full clone.
             clheads = set(repo.changelog.heads())
             heads = set(opts.get('heads', set()))