Revert "feat: merge mixins options"

[manniL]

This reverts commit ad4d61c.

Sorry for the problems and inconveniences caused!

Resolves #269 nuxt-modules/i18n#127 nuxt/nuxt#3957

[codecov]

Codecov Report

Merging #273 into master will decrease coverage by 1.26%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #273      +/-   ##
=========================================
- Coverage   41.57%   40.3%   -1.27%     
=========================================
  Files          18      18              
  Lines         267     263       -4     
=========================================
- Hits          111     106       -5     
- Misses        156     157       +1

Impacted Files	Coverage Δ
src/shared/plugin.js	51.72% <ø> (-1.61%)	⬇️
src/shared/getComponentOption.js	100% <100%> (ø)	⬆️
src/shared/getMetaInfo.js	94.64% <0%> (-1.79%)	⬇️

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[bdrtsky]

So, merging is not working? I am trying to use head from mixin with Nuxt and it doesn't work.

[manniL]

We had to revert that PR because it broke reactivity here and there.
Feel free to create another issue if there is none yet @bdrtsky