Only show First Sync Dialog once #769

Job	Run time
Ubuntu 20.04 AppImage (x86_64)	27m 23s
Ubuntu 20.04 AppImage (x86_64, gcc 11)	26m 19s
Build macOS (arm64)	26m 33s
Ubuntu 22.04 AppImage (x86_64)	25m 14s
Build macOS (x86_64)	38m 47s
Windows MSVC 2019 (x86)	23m 24s
Source Tarball	2m 2s
Windows MSVC 2019 (x86_64)	21m 52s
Windows MSVC 2022 (x86)	23m 36s
Windows MSVC 2022 (x86_64)	22m 39s
Package macOS (x86_64, arm64, universal)	6m 28s
	4h 4m 17s

Provide feedback