Retrie refactoring fails when variable name has quote mark

These lines from output suggest the reason for failure.

My variable was named `ry'`

```
shellCmd:
xargs grep -l 'ry''
```

---

Using VSCode Haskell extension, latest version (v1.4.0).
On WSL2 Ubuntu.

```
haskell-language-server version: 1.0.0.0 (GHC: 8.10.4) (PATH: /home/jt2/.ghcup/bin/haskell-language-server-wrapper-1.0.0) (GIT hash: 4cd1cf934638881e52b3eba9f70157a4b799c0e9)
Tool versions found on the $PATH
cabal: 3.4.0.0
stack: 2.7.1
ghc: 8.10.4
```

---

Related note: the file sometimes needs to be saved first, before activating retrie refactoring. Probably expected behaviour. In case someone finds this useful.