Remove an obsolete TODO for vkGetPhysicalDevicePresentRectanglesKHR

On Android, vkGetPhysicalDevicePresentRectanglesKHR will just return the
whole screen.

Bug: 143294545
Test: build, flash and boot
Change-Id: Iade1771ce90115d912e047018cb64514cc7c9624
diff --git a/vulkan/libvulkan/swapchain.cpp b/vulkan/libvulkan/swapchain.cpp
index a44b9e7..21b80b7 100644
--- a/vulkan/libvulkan/swapchain.cpp
+++ b/vulkan/libvulkan/swapchain.cpp
@@ -970,7 +970,6 @@
                   strerror(-err), err);
         }
 
-        // TODO(b/143294545): Return something better than "whole window"
         pRects[0].offset.x = 0;
         pRects[0].offset.y = 0;
         pRects[0].extent = VkExtent2D{static_cast<uint32_t>(width),