Fix: missing installed_plugins in version (#16004)

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- related #15972

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In #15972 I was very eager removing fowarded features from `nu` to
`nu-cmd-lang`. By accident I also removed `nu-cmd-lang/plugin` too. This
removed `installed_plugins` from `version`. By adding the feature again,
it works again.

Cargo.toml

@@ -269,6 +269,7 @@ plugin = [
 
   # features
   "nu-cli/plugin",
+  "nu-cmd-lang/plugin",
   "nu-command/plugin",
   "nu-engine/plugin",
   "nu-engine/plugin",