Visualizer Effect: Fix SCALING_MODE_NORMALIZED

Test: Clarity test on sine wave, enable SCALING_MODE_NORMALIZED
Bug: 135469767
Change-Id: Id31d34dccb8a4440600925c54bd2ca5645530d8f
diff --git a/media/libeffects/visualizer/EffectVisualizer.cpp b/media/libeffects/visualizer/EffectVisualizer.cpp
index 00bc371..f838892 100644
--- a/media/libeffects/visualizer/EffectVisualizer.cpp
+++ b/media/libeffects/visualizer/EffectVisualizer.cpp
@@ -388,7 +388,7 @@
             maxSample = fmax(maxSample, fabs(smp));
         }
         if (maxSample > 0.f) {
-            fscale = 127.f / maxSample;
+            fscale = 0.99f / maxSample;
             int exp; // unused
             const float significand = frexp(fscale, &exp);
             if (significand == 0.5f) {