file named `:w`

In 9462bbabbfcd66069a4f992bfa837f523800820e (https://github.com/mrcjkb/haskell-tools.nvim/commit/9462bbabbfcd66069a4f992bfa837f523800820e#diff-e6a2e40f4a1c4e736ba8ff9d046dbdc4d212d503f2f12c22aec8c91dcd4f278c) it appears a file was mistakenly saved as `:w`. This makes the repo unclonable on Windows/NTFS where `:` is an illegal character in paths.