Update javascript.nix

Author: bobvanderlinden

src/modules/languages/javascript.nix

@@ -243,10 +243,9 @@ in
       '') ++
       (lib.optional cfg.bun.install.enable ''
         source ${initBunScript}
-      '')
-      ''
-      export PATH="${nodeModulesPath}/.bin:$PATH"
-      ''
+      '') ++ [
+        "export PATH="${nodeModulesPath}/.bin:$PATH"
+      ]
     );
   };
 }