Don't hide QSystemTrayIconSys window (#559) #1395

Job	Run time
build-flatpak	8m 24s
build-rpm (fedora:39, gcc)	9m 39s
build-rpm (fedora:39, clang)	6m 26s
build-rpm (fedora:40, gcc)	6m 7s
build-rpm (fedora:40, clang)	6m 29s
build-rpm (fedora:41, gcc)	6m 4s
build-windows-mingw	7m 40s
build-rpm (fedora:41, clang)	7m 47s
build-deb (debian:12)	4m 41s
build-rpm (opensuse/tumbleweed:latest, gcc)	6m 28s
build-deb (ubuntu:24.04)	6m 30s
reuse-lint	17s
build-deb (ubuntu:24.10)	5m 48s
build-macos / build-macos (arm64)	16m 58s
build-macos / build-macos (x86_64)	29m 15s
build-windows-msvc (msvc) / build-windows-msvc	11m 48s
build-windows-msvc (msvc-clang) / build-windows-msvc	11m 20s
	2h 31m 41s

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