Fix binding group in custom_material_2d.wgsl (bevyengine#10841)

# Objective

Fix bevyengine#10840 

## Solution

The material's binding group number was changed in bevyengine#10485

assets/shaders/custom_material_2d.wgsl

@@ -2,9 +2,9 @@
 // we can import items from shader modules in the assets folder with a quoted path
 #import "shaders/custom_material_import.wgsl"::COLOR_MULTIPLIER
 
-@group(1) @binding(0) var<uniform> material_color: vec4<f32>;
-@group(1) @binding(1) var base_color_texture: texture_2d<f32>;
-@group(1) @binding(2) var base_color_sampler: sampler;
+@group(2) @binding(0) var<uniform> material_color: vec4<f32>;
+@group(2) @binding(1) var base_color_texture: texture_2d<f32>;
+@group(2) @binding(2) var base_color_sampler: sampler;
 
 @fragment
 fn fragment(mesh: VertexOutput) -> @location(0) vec4<f32> {