fix(ComboBox): Add missing onSelectionChange event prop

[Lukas742]

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[coveralls]

Pull Request Test Coverage Report for Build 635114482

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 79.779%

---

Totals
Change from base Build 634974360:	0.0%
Covered Lines:	2742
Relevant Lines:	3437

---

💛 - Coveralls

[github-actions]

Size Change: +7 B (0%)

Total Size: 188 kB

Filename	Size	Change
packages/main/dist/ComboBox.js	549 B	+7 B (+1%)

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