Fix audio volume levels for cows and bats (#1225)

Cow volume 0.4f to 1.f
Bat volume 0.1f to 0.8f

Minecraft.World/Bat.cpp

@@ -30,7 +30,7 @@ void Bat::defineSynchedData()
 
 float Bat::getSoundVolume()
 {
-	return 0.1f;
+	return 0.8f;
 }
 
 float Bat::getVoicePitch()

Minecraft.World/Cow.cpp

@@ -72,7 +72,7 @@ void Cow::playStepSound(int xt, int yt, int zt, int t)
 
 float Cow::getSoundVolume() 
 {
-	return 0.4f;
+	return 1.f;
 }
 
 int Cow::getDeathLoot()