chromium/update.sh: Fix spacing in cache messages.

This commit doesn't add any feature and just fixes a small annoyance which
result in messages like this:

Checking if xxx applies...no.

See that there is no whitespace between "..." and "no"? Well, the world cares
for more important things, but for me personally those minor annoyances can turn
into major annoyances.

pkgs/applications/networking/browsers/chromium/update.sh

@@ -83,9 +83,9 @@ get_channel_exprs()
         echo -n "Checking if sha256 of version $version is cached..." >&2;
         if sha256="$(sha_lookup "$version")";
         then
-            echo "yes: $sha256" >&2;
+            echo " yes: $sha256" >&2;
         else
-            echo "no." >&2;
+            echo " no." >&2;
             sha256="$(get_sha256 "$channel" "$version" "$url")";
         fi;