fix(gatsby-recipes): Only remove the ".mdx" ending if running local recipe (#27718)

This fixes showing the correct install command when running recipes from the recipes list shown when running `gatsby recipes`

Author: KyleAMathews

packages/gatsby-recipes/src/cli/index.js

@@ -435,7 +435,11 @@ export default async ({
             </Text>
             <RecipesList
               setRecipe={async recipeItem => {
-                setRecipe(recipeItem.value.slice(0, -4))
+                if (recipeItem.value.endsWith(`.mdx`)) {
+                  setRecipe(recipeItem.value.slice(0, -4))
+                } else {
+                  setRecipe(recipeItem.value)
+                }
                 trackCli(`RECIPE_RUN`, { name: recipeItem.value })
                 showRecipesList = false
                 try {