fix conditional for saturation finding.

closes 179

locklost/plugins/saturations.py

@@ -185,13 +185,13 @@ def set_ylims(saturations, xmax, buffer):
         ymins.append(min(scaling_vals))
         ymaxs.append(max(scaling_vals))
 
-    if max(ymaxs) > 0:
+    if max(ymaxs) >= 0:
         ymax = 1.1*max(ymaxs)
-    elif max(ymaxs) < 0:
+    else:
         ymax = 0.9*max(ymaxs)
-    if min(ymins) < 0:
+    if min(ymins) <= 0:
         ymin = 1.1*min(ymins)
-    elif min(ymins) > 0:
+    else:
         ymin = 0.9*min(ymins)
 
     if ymin > -1: