fix(vue-app): use globals.nuxt for fetch client mixin

[pi0]

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

fixes #7096

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• 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 #7103 into dev will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #7103   +/-   ##
=======================================
  Coverage   62.69%   62.69%           
=======================================
  Files          84       84           
  Lines        3394     3394           
  Branches      926      926           
=======================================
  Hits         2128     2128           
  Misses       1018     1018           
  Partials      248      248           

Flag	Coverage Δ
#unittests	62.69% <ø> (ø)

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