revert to vanilla assets

public/assets/minecraft/shaders/core/position.vsh

@@ -0,0 +1,17 @@
+#version 330
+
+#moj_import <minecraft:fog.glsl>
+#moj_import <minecraft:dynamictransforms.glsl>
+#moj_import <minecraft:projection.glsl>
+
+in vec3 Position;
+
+out float sphericalVertexDistance;
+out float cylindricalVertexDistance;
+
+void main() {
+    gl_Position = ProjMat * ModelViewMat * vec4(Position, 1.0);
+
+    sphericalVertexDistance = fog_spherical_distance(Position);
+    cylindricalVertexDistance = fog_cylindrical_distance(Position);
+}