configitems: register the 'format.usestore' config

mercurial/configitems.py

@@ -131,6 +131,9 b" coreconfigitem('format', 'usefncache',"
 coreconfigitem('format', 'usegeneraldelta',
     default=True,
 )
+coreconfigitem('format', 'usestore',
+    default=True,
+)
 coreconfigitem('hostsecurity', 'ciphers',
     default=None,
 )

mercurial/localrepo.py

@@ -2074,7 +2074,7 b' def newreporequirements(repo):'
     """
     ui = repo.ui
     requirements = {'revlogv1'}
-    if ui.configbool('format', 'usestore', True):
+    if ui.configbool('format', 'usestore'):
         requirements.add('store')
         if ui.configbool('format', 'usefncache'):
             requirements.add('fncache')