Gbuffer bit check fix

src/plugins/pipeline/GBufferPlugin.ts

           x : Empty
           y : first 3 bits lut index, second 5 bits bevel radius
           z : material id (userData.gBufferData?.materialId, userData.matId)
-          w : this field is for setting bits - lutEnable-0, tonemap-1, bloom-2, ssao(cast)-3, dof-4
+          w : this field is for setting bits - lutEnable-0, tonemap-1, bloom-2, ssao(cast)-3, dof-4, diamondMask-5
         */
 
         this.uniforms.flags.value.set(255, 255, 255, 255)

src/plugins/postprocessing/shaders/TonemapPlugin.pars.glsl

 int getToneMapBit(in int number) {
-    return (number/2) % 2; // 2nd bit
+    #ifdef WebGL2Context
+    return (number/2) % 2;
+    #else
+    return int(mod(floor(float(number)/2.), 2.));
+    #endif
 }
 
 vec3 TonemappingSaturation(vec3 rgb) {