Meta: Make file-system resizing work on macOS

Previously we'd fail to execute the resize2fs tool which then results
in us recreating the image from scratch:

resizing disk image...
Image resized.
line 132: /usr/sbin/resize2fs: No such file or directory
failed, not using existing image
done

Meta/build-image-qemu.sh

@@ -49,6 +49,7 @@ if [ "$(uname -s)" = "Darwin" ]; then
  export PATH="/opt/homebrew/opt/e2fsprogs/sbin:$PATH"
 
  E2FSCK="e2fsck"
+ RESIZE2FS_PATH="resize2fs"
 elif [ "$(uname -s)" = "SerenityOS" ]; then
  E2FSCK="/usr/local/sbin/e2fsck"
 else