Revert "Add :legacy/merge-indents? to .cljfmt.edn (#47345)" (#47357)

This reverts commit 3759c8d4.

.cljfmt.edn

 ;; Cljfmt config. See https://github.com/weavejester/cljfmt#formatting-options
-{;; Following option is required for cljfmt to run correctly in vscode/calva.
- ;; Source: https://calva.io/formatting/#indentation-rules
- :legacy/merge-indents? true
- 
- :sort-ns-references?
+{:sort-ns-references?
  true
 
  :function-arguments-indentation