revert kwarg-only definitions for splatalogue

fix typo

Author: keflavich

astroquery/splatalogue/core.py

@@ -419,7 +419,7 @@ def _validate_kwargs(self, *, min_frequency=None, max_frequency=None,
                                  "a valid Band.")
 
     @prepend_docstr_nosections("\n" + _parse_kwargs.__doc__)
-    def query_lines_async(self, *, min_frequency=None, max_frequency=None,
+    def query_lines_async(self, min_frequency=None, max_frequency=None, *,
                           cache=True, **kwargs):
         """