fix(types): correct vue.config types

[danielroe]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)

Description

The type was wrongly a string literal rather than a nested object.

Checklist:

• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[codecov-io]

Codecov Report

Merging #8362 (edc8e21) into dev (7278b10) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #8362   +/-   ##
=======================================
  Coverage   68.55%   68.55%           
=======================================
  Files          91       91           
  Lines        3876     3876           
  Branches     1056     1056           
=======================================
  Hits         2657     2657           
  Misses        991      991           
  Partials      228      228           

Flag	Coverage Δ
unittests	68.55% <ø> (ø)

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