[flutter_local_notifications_windows] Fix URIs on Windows -- images and audio #344

Job	Run time
Dart formatting checks	23s
Dart formatting checks	23s
Build Android example app (3.19)	3m 48s
Build Android example app (3.19)	3m 48s
Run Dart Analyzer	37s
Run Dart Analyzer	37s
Build Android example app (stable channel)	6m 20s
Build Android example app (stable channel)	6m 20s
Build iOS example app (3.19)	2m 25s
Build iOS example app (3.19)	2m 25s
Build iOS example app (stable channel)	1m 35s
Build iOS example app (stable channel)	1m 35s
Build macOS example app (3.19)	2m 14s
Build macOS example app (3.19)	2m 14s
Build Linux example app (stable channel)	59s
Build Linux example app (stable channel)	59s
Build macOS example app (stable channel)	1m 53s
Build macOS example app (stable channel)	1m 53s
Build Linux example app (3.19)	1m 31s
Build Linux example app (3.19)	1m 31s
Build Windows example app (stable channel)	5m 10s
Build Windows example app (stable channel)	5m 10s
Build Windows example app (3.19)	4m 57s
Build Windows example app (3.19)	4m 57s
Run integration tests (Android)	4m 55s
Run integration tests (Android)	4m 55s
Run integration tests (iOS)	3m 43s
Run integration tests (iOS)	3m 43s
Run all unit tests (Android)	4m 11s
Run all unit tests (Android)	4m 11s
Run all unit tests except for Windows (Dart)	1m 7s
Run all unit tests except for Windows (Dart)	1m 7s
Run Windows unit tests (Dart)	3m 42s
Run Windows unit tests (Dart)	4m 31s
	1h 39m 49s

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