fix(vue-app): don't fetch payload for store mutation for preview and spa fallback

[atinux]

…a fallback

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

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-commenter]

Codecov Report

Merging #7723 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #7723   +/-   ##
=======================================
  Coverage   70.13%   70.13%           
=======================================
  Files          88       88           
  Lines        3764     3764           
  Branches     1025     1025           
=======================================
  Hits         2640     2640           
  Misses        913      913           
  Partials      211      211           

Flag	Coverage Δ
#unittests	70.13% <ø> (ø)

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