fix(vue-app): layout in error.vue not work for Vue.extend component

[clarkdo]

Types of changes

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

Description

Fix #6651
Reported from Discord from @aldarund , when component is from Vue.extend, the layout on error.vue doesn't, this is because layout is component.options.layout but not component.layout.

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 #6650 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #6650   +/-   ##
=======================================
  Coverage   95.79%   95.79%           
=======================================
  Files          78       78           
  Lines        2713     2713           
  Branches      702      702           
=======================================
  Hits         2599     2599           
  Misses         99       99           
  Partials       15       15

Flag	Coverage Δ
#e2e	100% <ø> (ø)	⬆️
#fixtures	64.65% <ø> (ø)	⬆️
#unit	92.29% <ø> (ø)	⬆️

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