Fix Mix RGBD/GAMMA in refraction

My bad...

src/Shaders/pbr.fragment.fx

@@ -508,11 +508,11 @@ void main(void) {
             }
         #endif
 
-        #ifdef GAMMAREFRACTION
+        #ifdef RGBDREFRACTION
             environmentRefraction.rgb = fromRGBD(environmentRefraction);
         #endif
 
-        #ifdef RGBDREFRACTION
+        #ifdef GAMMAREFRACTION
             environmentRefraction.rgb = toLinearSpace(environmentRefraction.rgb);
         #endif
 
@@ -905,4 +905,4 @@ void main(void) {
     //gl_FragColor = vec4(eho, eho, eho, 1.0);
 
     //gl_FragColor = vec4(seo * eho, seo * eho, seo * eho, 1.0);
-}
+}