Cleanup: Vulkan: Remove unused flags

Removing unused flags when creating descriptor pools.

source/blender/gpu/vulkan/vk_descriptor_pools.cc

@@ -53,7 +53,6 @@ void VKDescriptorPools::add_new_pool(const VKDevice &device)
       {VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT, POOL_SIZE_INPUT_ATTACHMENT}};
   VkDescriptorPoolCreateInfo pool_info = {};
   pool_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
-  pool_info.flags = VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT;
   pool_info.maxSets = POOL_SIZE_DESCRIPTOR_SETS;
   pool_info.poolSizeCount = pool_sizes.size();
   pool_info.pPoolSizes = pool_sizes.data();

source/blender/gpu/vulkan/vk_resource_pool.cc

@@ -149,6 +149,7 @@ void VKDiscardPool::destroy_discarded_resources(VKDevice &device, bool force)
 
   // TODO: Introduce reuse_old as the allocations can all be reused by resetting the pool.
   descriptor_pools_.remove_old(current_timeline, [&](VkDescriptorPool vk_descriptor_pool) {
+    vkResetDescriptorPool(device.vk_handle(), vk_descriptor_pool, 0);
     vkDestroyDescriptorPool(device.vk_handle(), vk_descriptor_pool, nullptr);
   });
 }