Remove unused flags from registry login (#128)

fixes #120 

These flags were unused, so remove for clarity.

Signed-off-by: Kathryn Baldauf <k_baldauf@apple.com>

Author: katiewasnothere

Sources/CLI/Registry/Login.swift

@@ -36,9 +36,6 @@ extension Application {
         @Argument(help: "Registry server name")
         var server: String
 
-        @OptionGroup
-        var global: Flags.Global
-
         @OptionGroup
         var registry: Flags.Registry