Update sys users signature (#13172)

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Fixes #13171 

# Description
Corrects the `sys users` signature to match the returned type.

Before this change `sys users | where name == root` would result in a
type error.
 
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crates/nu-command/src/system/sys/users.rs

@@ -13,7 +13,7 @@ impl Command for SysUsers {
     fn signature(&self) -> Signature {
         Signature::build("sys users")
             .category(Category::System)
-            .input_output_types(vec![(Type::Nothing, Type::record())])
+            .input_output_types(vec![(Type::Nothing, Type::table())])
     }
 
     fn usage(&self) -> &str {