Support Fourmolu 0.7 in CLI mode

Fourmolu 0.7 (due to Ormolu 0.5) removes the `--cabal-default-extensions` flag, instead looking for Cabal files by default. If input is taken from stdin and `--stdin-input-file` isn't specified, it therefore fails.

We don't need to make any changes in non-CLI mode because the Cabal file handling logic occurs at a higher level outside the entry point we use to the library (the `ormolu` function).

Author: georgefst

plugins/hls-fourmolu-plugin/src/Ide/Plugin/Fourmolu.hs

@@ -66,7 +66,7 @@ provider plId ideState typ contents fp fo = withIndefiniteProgress title Cancell
                 (exitCode, out, err) <-
                     readCreateProcessWithExitCode
                         ( proc "fourmolu" $
-                            ["-d"]
+                            ["-d", "--no-cabal"]
                                 <> catMaybes
                                     [ ("--start-line=" <>) . show <$> regionStartLine region
                                     , ("--end-line=" <>) . show <$> regionEndLine region