Pass the correct script handle for translations

[dd32]

Fix translations by passing the script handle to wp_set_script_translations() rather than the block name.

In testing the Block Directory in non-english, I ran into these blocks not loading translations. Turned out it's passing the block slug rather than the script to localise.

[johngodley]

The blocks are designed to be released individually, not as a 'block-experiments' bundle, and they must be packaged with the included script. This will ensure that the current wp_set_script_translations value is correct.

[dd32]

You've misunderstood the PR.

The build process is not changing the first parameter to wp_set_script_translations(), which is intended on being the Script Handle, but is currently being passed a block slug.

This PR changes that parameter to the block-experiments literal that the build process seems to use to set the correct handle.

[johngodley]

Alright, the reason for my confusion is that I had already added the correct translation call:

https://github.com/Automattic/block-experiments/blob/master/bundler/template/index.php#L44

But it was added somewhere else, and apparently without realising that there was an existing (incorrect) translation call added in #39. My change was unreleased so doesn't yet appear on wp.org.

I'll remove the one I added and go with the one here.