fix phasing analysis misspec

Author: tristanpwdennis

malariagen_data/as1.py

@@ -110,8 +110,8 @@ def __init__(
             site_filters_analysis=site_filters_analysis,
             discordant_read_calls_analysis=discordant_read_calls_analysis,
             default_site_mask="stephensi",
-            default_phasing_analysis="stephensi",
-            default_coverage_calls_analysis="stephensi",
+            default_phasing_analysis=None,
+            default_coverage_calls_analysis=None,
             bokeh_output_notebook=bokeh_output_notebook,
             results_cache=results_cache,
             log=log,