mx_lib: fixed clean_filename

src/aare/devices/mx_lib.py

@@ -247,7 +247,7 @@ def wait_enum_condition(pv: PV, value: Union[str, int, re.Pattern], *, timeout:
         raise TimeoutError(f"timeout waiting for enum {pv.pvname} == {value},"
                            f"current value is {pv.get(as_string=True)}")
 
-def clean_filename(self, filename: str) -> str:
+def clean_filename(filename: str) -> str:
     cleaned = re.sub(r"[^A-Za-z0-9._-]", "_", filename.strip())
     cleaned = cleaned.strip("._-")
     if not cleaned: