serve/http: fix --disable-zip so it works over rc

The --disable-zip flag was registered manually and was missing from
OptionsInfo, so it could not be set over the rc interface. Move it
into OptionsInfo like serve webdav does, which keeps the command line
flag and also makes it settable via rc.

cmd/serve/http/http.go

@@ -35,7 +35,11 @@ import (
 )
 
 // OptionsInfo describes the Options in use
-var OptionsInfo = fs.Options{}.
+var OptionsInfo = fs.Options{{
+	Name:    "disable_zip",
+	Default: false,
+	Help:    "Disable zip download of directories",
+}}.
 	Add(libhttp.ConfigInfo).
 	Add(libhttp.AuthConfigInfo).
 	Add(libhttp.TemplateConfigInfo)
@@ -45,7 +49,7 @@ type Options struct {
 	Auth       libhttp.AuthConfig
 	HTTP       libhttp.Config
 	Template   libhttp.TemplateConfig
-	DisableZip bool
+	DisableZip bool `config:"disable_zip"`
 }
 
 // DefaultOpt is the default values used for Options
@@ -74,7 +78,6 @@ func init() {
 	flags.AddFlagsFromOptions(flagSet, "", OptionsInfo)
 	vfsflags.AddFlags(flagSet)
 	proxyflags.AddFlags(flagSet)
-	flagSet.BoolVar(&Opt.DisableZip, "disable-zip", false, "Disable zip download of directories")
 	cmdserve.Command.AddCommand(Command)
 	cmdserve.AddRc("http", func(ctx context.Context, f fs.Fs, in rc.Params) (cmdserve.Handle, error) {
 		// Read VFS Opts