refactor: use correct import in template-renderer entrypoint

[web-padawan]

Description

Updated this file to align with index.js and style-modules.js in the same package.
While current export seems to work with native ES modules the eslint-plugin-import reports a warning:

/Users/serhii/vaadin/web-components/packages/polymer-legacy-adapter/template-renderer.js
  6:15  error  No named exports found in module './src/template-renderer.js'

Type of change

• Refactor

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud