fix(vue-renderer): apply nomodule to legacy chunks

[danielroe]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

An earlier PR (#7919) accidentally added nomodule to the runtime chunk rather than just legacy ones. This fixes that issue and should still work with #7918 (but this should be tested - I don't have a repro).

closes #7927

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.