Normalise casing of histogram mode

Author: jfrost-mo

src/CSET/cset_workflow/flow.cylc

@@ -101,7 +101,7 @@ final cycle point = {{CSET_TRIAL_END_DATE}}
         {% if SKIP_WRITE|default(False) %}
         SKIP_WRITE = True
         {% endif %}
-        HISTOGRAM_METHOD = {{HISTOGRAM_METHOD|default("Frequency")}}
+        HISTOGRAM_METHOD = {{HISTOGRAM_METHOD|default("frequency")}}
 
 
     [[PROCESS]]

src/CSET/cset_workflow/opt/rose-suite-RAL3LFRIC.conf

@@ -20,7 +20,7 @@ DETERMINISTIC_PLOT_CAPE_RATIO=False
 DETERMINISTIC_PLOT_INFLOW_PROPERTIES=False
 EXTRACT_MLEVEL_TRANSECT=False
 EXTRACT_PLEVEL_TRANSECT=False
-HISTOGRAM_METHOD_SURFACE="Density"
+HISTOGRAM_METHOD="density"
 HISTOGRAM_MLEVEL_FIELD=False
 HISTOGRAM_MLEVEL_FIELD_AGGREGATION=False,False,False,False
 HISTOGRAM_MLEVEL_FIELD_SEQUENCE=False

src/CSET/cset_workflow/rose-suite.conf.example

@@ -22,7 +22,7 @@ DETERMINISTIC_PLOT_CAPE_RATIO=False
 DETERMINISTIC_PLOT_INFLOW_PROPERTIES=False
 EXTRACT_MLEVEL_TRANSECT=False
 EXTRACT_PLEVEL_TRANSECT=False
-HISTOGRAM_METHOD="Density"
+HISTOGRAM_METHOD="density"
 HISTOGRAM_MLEVEL_FIELD=False
 HISTOGRAM_MLEVEL_FIELD_AGGREGATION=False,False,False,False
 HISTOGRAM_MLEVEL_FIELD_SEQUENCE=False