hgweb: register web.static to the config table

Otherwise we would got a develwarn.

mercurial/configitems.py

@@ -1352,6 +1352,9 b" coreconfigitem('web', 'refreshinterval',"
 coreconfigitem('web', 'server-header',
     default=None,
 )
+coreconfigitem('web', 'static',
+    default=None,
+)
 coreconfigitem('web', 'staticurl',
     default=None,
 )

mercurial/hgweb/hgwebdir_mod.py

@@ -383,8 +383,7 b' class hgwebdir(object):'
                     fname = virtual[7:]
                 else:
                     fname = req.qsparams['static']
-                static = self.ui.config("web", "static", None,
-                                        untrusted=False)
+                static = self.ui.config("web", "static", untrusted=False)
                 if not static:
                     tp = self.templatepath or templater.templatepaths()
                     if isinstance(tp, str):

mercurial/hgweb/webcommands.py

@@ -1221,7 +1221,7 b' def static(web):'
     fname = web.req.qsparams['file']
     # a repo owner may set web.static in .hg/hgrc to get any file
     # readable by the user running the CGI script
-    static = web.config("web", "static", None, untrusted=False)
+    static = web.config("web", "static", untrusted=False)
     if not static:
         tp = web.templatepath or templater.templatepaths()
         if isinstance(tp, str):