set the colormode to fixed in the distrubtion panel of the fslbm

benchmark to make uncategorized sweeps gray

dashboards/dashboard_walberla.py

@@ -304,6 +304,7 @@ def dashboard_fslbmgravitywave():
             gradientMode="Opacity",
             tooltipMode="single",
             overrides=overrides,
+            colorMode="fixed",
         ))
 
     panels.append(