Change default light softness from 0 to 0.2.

PiperOrigin-RevId: 960218397
Change-Id: I58f211f5a275f8f19254424facd02c14eaa8c668

src/user/user_init.c

@@ -204,6 +204,7 @@ void mjs_defaultLight(mjsLight* light) {
   light->active = 1;
   light->attenuation[0] = 1;
   light->cutoff = 45;
+  light->softness = 0.2;
   light->exponent = 10;
   light->diffuse[0] = light->diffuse[1] = light->diffuse[2] = 0.7;
   light->specular[0] = light->specular[1] = light->specular[2] = 0.3;