fix(CodeEditor): to have fall back value when extension doesn't exists (#5560)

Author: matthprost

.changeset/puny-streets-smash.md

@@ -0,0 +1,5 @@
+---
+"@ultraviolet/plus": patch
+---
+
+Fix `<CodeEditor />` to have fallback value

packages/plus/src/components/CodeEditor/CodeEditor.tsx

@@ -164,7 +164,7 @@ export const CodeEditor = ({
         className={className}
         data-testid={dataTestId}
         editable={!disabled || !readOnly}
-        extensions={[langs[extensions]()]}
+        extensions={[langs[extensions]?.() ?? langs['sh']]}
         height={height}
         id={id}
         onBlur={onBlur}