script: undo print-nia-checksums.sh comment

This was accidentally commented out by "std/vp8: blend VP8X ALPH chunk",
commit d9cf0751ca5fe31afca40063052e047e3f4b177d.

script/print-nia-checksums.sh

diff --git a/script/print-nia-checksums.sh b/script/print-nia-checksums.sh
index a2e8c05..8e473a3 100755
--- a/script/print-nia-checksums.sh
+++ b/script/print-nia-checksums.sh
@@ -47,8 +47,7 @@
 # ----
 
 handle() {
-  #local c=$(gen/bin/example-convert-to-nia --output-crc32-digest <$1 2>/dev/null)
-  local c=$(gen/bin/example-convert-to-nia --output-crc32-digest <$1)
+  local c=$(gen/bin/example-convert-to-nia --output-crc32-digest <$1 2>/dev/null)
   if [ "$c" != "BAD 00000000" ]; then
     echo $c $1
   fi