fix: Update __init__.py to move "file" param to "print" (snakemake#2291)

fix
```python
            print(
                "Error: no Snakefile found, tried {}.".format(
                    ", ".join(SNAKEFILE_CHOICES), file=sys.stderr
                )
            )
```

### Description

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### QC
<!-- Make sure that you can tick the boxes below. -->

* [ ] The PR contains a test case for the changes or the changes are
already covered by an existing test case.
* [ ] The documentation (`docs/`) is updated to reflect the changes or
this is not necessary (e.g. if the change does neither modify the
language nor the behavior or functionalities of Snakemake).

Co-authored-by: Johannes Köster <johannes.koester@tu-dortmund.de>

snakemake/__init__.py

@@ -2944,8 +2944,9 @@ def adjust_path(f):
         if args.snakefile is None:
             print(
                 "Error: no Snakefile found, tried {}.".format(
-                    ", ".join(SNAKEFILE_CHOICES), file=sys.stderr
-                )
+                    ", ".join(SNAKEFILE_CHOICES)
+                ),
+                file=sys.stderr,
             )
             sys.exit(1)