Fix the example lighting shaders to use both frag and diffuse colors so they work with shapes and meshes. (#4482)

examples/shaders/resources/shaders/glsl100/lighting.fs

@@ -40,6 +40,8 @@ void main()
     vec3 viewD = normalize(viewPos - fragPosition);
     vec3 specular = vec3(0.0);
 
+    vec4 tint = colDiffuse * fragColor;
+
     // NOTE: Implement here your fragment shader code
 
     for (int i = 0; i < MAX_LIGHTS; i++)
@@ -67,7 +69,7 @@ void main()
         }
     }
 
-    vec4 finalColor = (texelColor*((colDiffuse + vec4(specular, 1.0))*vec4(lightDot, 1.0)));
+    vec4 finalColor = (texelColor*((tint + vec4(specular, 1.0))*vec4(lightDot, 1.0)));
     finalColor += texelColor*(ambient/10.0);
 
     // Gamma correction