Colour: Fix comparisons in HSL conversions

modules/juce_graphics/colour/juce_Colour.cpp

@@ -82,12 +82,12 @@ namespace ColourHelpers
 
             lightness = ((float) (hi + lo) / 2.0f) / 255.0f;
 
-            if (lightness < 0.0f)
+            if (lightness <= 0.0f)
                 return;
 
             hue = getHue (col);
 
-            if (1.0f < lightness)
+            if (1.0f <= lightness)
                 return;
 
             auto denominator = 1.0f - std::abs ((2.0f * lightness) - 1.0f);