Fix SetStorageBuffer binding indexing

[zeozeozeo]

Previously SetStorageBuffer would always assume the renderpass's bind group even if we have a compute pass active.

Repro:

#include <raygpu.h>
#include <cstdio>

void setup() {
    const char* shaderCode = R"(
@group(0) @binding(0) var<storage, read_write> b0: array<u32>;
@group(0) @binding(1) var<storage, read_write> b1: array<u32>;
@group(0) @binding(2) var<storage, read_write> b2: array<u32>;
@group(0) @binding(3) var<storage, read_write> b3: array<u32>;
@group(0) @binding(4) var<storage, read_write> b4: array<u32>;

@compute @workgroup_size(1)
fn main() {
    b4[0] = 123u;
}
    )";

    ResourceTypeDescriptor resources[] = {
        { storage_buffer, 0, 0, access_type_readwrite, we_dont_know, RGShaderStage_Compute },
        { storage_buffer, 0, 1, access_type_readwrite, we_dont_know, RGShaderStage_Compute },
        { storage_buffer, 0, 2, access_type_readwrite, we_dont_know, RGShaderStage_Compute },
        { storage_buffer, 0, 3, access_type_readwrite, we_dont_know, RGShaderStage_Compute },
        { storage_buffer, 0, 4, access_type_readwrite, we_dont_know, RGShaderStage_Compute },
    };

    DescribedComputePipeline* pipeline = LoadComputePipelineEx(shaderCode, resources, 5);

    DescribedBuffer* buffers[5];
    uint32_t data = 0;
    
    for(int i = 0; i < 5; i++) {
        buffers[i] = GenBufferEx(&data, sizeof(uint32_t), RGBufferUsage_Storage | RGBufferUsage_CopyDst);
    }

    BeginComputepass();
    BindComputePipeline(pipeline);

    for(int i = 0; i < 5; i++) {
        printf("SetStorageBuffer(%d, ...)\n", i); 
        SetStorageBuffer(i, buffers[i]);
    }

    DispatchCompute(1, 1, 1);
    EndComputepass();
}

void render() {
    BeginDrawing();
    ClearBackground(RAYWHITE);
    EndDrawing();
}

int main(void) {
    SetConfigFlags(FLAG_VSYNC_HINT);
    ProgramInfo program = {
        .windowWidth = 800,
        .windowHeight = 600,
        .setupFunction = setup,
        .renderFunction = render,
    };
    InitProgram(program);
    return 0;
}

The above would print:

entry count: 5
ERROR: >> Validation error: Binding entry buffer not set.
 - While validating entries[0] against { binding: 0, visibility: ShaderStage::Compute, buffer: {type: BufferBindingType::Storage, minBindingSize: 0, hasDynamicOffset: 0} }.
 - While validating [BindGroupDescriptor] against [BindGroupLayout (unlabeled)]
 - While calling [Device].CreateBindGroup([BindGroupDescriptor]).

SetStorageBuffer(0, ...)
SetStorageBuffer(1, ...)
SetStorageBuffer(2, ...)
SetStorageBuffer(3, ...)
SetStorageBuffer(4, ...)
WARNING: Trying to set entry 4 on a BindGroup with only 4 entries

This fixes that.