fix codestyle in unique_ordered_append

Author: lexming

easybuild/tools/utilities.py

@@ -231,7 +231,7 @@ def unique_ordered_append(base, extra):
     try:
         base.extend(extra)
     except TypeError as err:
-        raise EasyBuildError( f"given extra list is not iterable: {extra}") from err
+        raise EasyBuildError(f"given extra list is not iterable: {extra}") from err
     except AttributeError as err:
         raise EasyBuildError(f"given base cannot be extended: {base}") from err