Update crate feature flags (#12566)

# Description
Remove unused/effect-less features, make sure we show all relevant
features in `version`

# User-Facing Changes
- **Remove unused feature `wasi`**
- will cause failure to build should you enable it. Otherwise no effect
- **Include feat `system-clipboard` in `version`**

crates/nu-cmd-lang/Cargo.toml

@@ -30,4 +30,4 @@ trash-support = []
 sqlite = []
 dataframe = []
 static-link-openssl = []
-wasi = []
+system-clipboard = []

crates/nu-cmd-lang/src/core_commands/version.rs

@@ -180,9 +180,9 @@ fn features_enabled() -> Vec<String> {
         names.push("static-link-openssl".to_string());
     }
 
-    #[cfg(feature = "wasi")]
+    #[cfg(feature = "system-clipboard")]
     {
-        names.push("wasi".to_string());
+        names.push("system-clipboard".to_string());
     }
 
     names.sort();