fix(build): Correct typos in PR #7169

[cpcallen]

The basics

• I branched from develop
• My pull request is against develop
• My code follows the style guide
• I ran npm run format and npm run lint

The details

Resolves

Three separate mistakes left only the Python and PHP chunks with the correct code for the legacy script exports.

Proposed Changes

Fix typos

Behaviour Before Change

Only python_compressed.js and php_compressed.js had correct code for legacy exports (Blockly.<Lang>) in their UMD wrappers.

Behaviour After Change

All five <lang>_compressed.js chunks get correct wrappers.

Reason for Changes

Don't want to break developer's code.

Test Coverage

Output manually checked.

[maribethb]

Nice, thanks!