Build electron for Mac Universal arch

[MikesGlitch]

Improve Electron Mac build to target "Universal" for better performance on Apple Silicon.

NOTE: this will increase the size of the Mac app from 111MB to 182MB

Tested by: michaelhofer - on #3004 (comment)

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[github-actions]

Bundle Stats — desktop-client

Hey there, this message comes from a GitHub action that helps you and reviewers to understand how these changes affect the size of this project's bundle.

As this PR is updated, I'll keep you updated on how the bundle size is impacted.

Total

Files count	Total bundle size	% Changed
9	4.95 MB	0%

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Asset	File Size	% Changed
static/js/indexeddb-main-thread-worker-e59fee74.js	13.5 kB	0%
static/js/resize-observer.js	18.37 kB	0%
static/js/BackgroundImage.js	122.29 kB	0%
static/js/narrow.js	76.15 kB	0%
static/js/usePreviewTransactions.js	790 B	0%
static/js/AppliedFilters.js	27.5 kB	0%
static/js/wide.js	272.32 kB	0%
static/js/ReportRouter.js	1.23 MB	0%
static/js/index.js	3.2 MB	0%

[github-actions]

Bundle Stats — loot-core

Hey there, this message comes from a GitHub action that helps you and reviewers to understand how these changes affect the size of this project's bundle.

As this PR is updated, I'll keep you updated on how the bundle size is impacted.

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Files count	Total bundle size	% Changed
1	1.13 MB	0%

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Asset	File Size	% Changed
kcab.worker.js	1.13 MB	0%