fix: use showSaveDialog with promise instead of callback

[faustbrian]

Changed but not mentioned in v7 or v8 changelog

[codecov]

Codecov Report

Merging #1711 into develop will decrease coverage by 0.05%.
The diff coverage is 75%.

@@             Coverage Diff             @@
##           develop    #1711      +/-   ##
===========================================
- Coverage    69.51%   69.46%   -0.06%     
===========================================
  Files          139      139              
  Lines         3809     3815       +6     
  Branches       795      797       +2     
===========================================
+ Hits          2648     2650       +2     
- Misses         996      999       +3     
- Partials       165      166       +1

Impacted Files	Coverage Δ
src/renderer/store/modules/plugin.js	100% <100%> (ø)	⬆️
src/renderer/models/profile.js	100% <100%> (ø)	⬆️
src/renderer/store/modules/session.js	36.89% <33.33%> (-0.47%)	⬇️

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