the entrypoint for R projects creates a .Rproj file where it shouldn't

[rokroskar]

If an .Rproj file already exists for the project, the entrypoint should not try to write one. Apparently this is failing, because on a new project I get

 base ▶ work ❯ r-plus-python ▶ master ▶ ✎ ▶ $ ▶ git status
On branch master
Your branch is up to date with 'origin/master'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   r-plus-python.Rproj

no changes added to commit (use "git add" and/or "git commit -a")