revert to vanilla assets

public/assets/minecraft/shaders/post/blit.fsh

@@ -0,0 +1,15 @@
+#version 330
+
+uniform sampler2D InSampler;
+
+layout(std140) uniform BlitConfig {
+    vec4 ColorModulate;
+};
+
+in vec2 texCoord;
+
+out vec4 fragColor;
+
+void main(){
+    fragColor = texture(InSampler, texCoord) * ColorModulate;
+}