cleanup: Simplify boolean returns. #2478

Job	Run time
Verify release/signatures	6s
Check for translatable strings	17s
Validate PR	7s
Alpine (full, Debug)	8m 14s
Debian (minimal, Debug)	4m 43s
Alpine (static) (Release)	7m 52s
Fedora with ASAN (full, Debug)	5m 46s
Ubuntu LTS (full, Release)	5m 32s
Clang-Tidy	6m 18s
Update nightly release tag	2s
macOS user (x86_64)	8m 14s
Flatpak	7m 14s
Docs	2m 1s
AppImage on Alpine (full, Release)	8m 2s
Android (arm64-v8a, Release, 6.2.4)	4m 2s
macOS distributable (arm64, 10.15)	4m 7s
Windows (x86_64, Release)	6m 47s
Test macOS distributable (arm64, 10.15)	28s
Test Windows (x86_64, Release)	34s
Test Flatpak	2m 2s
Test AppImage	34s
	1h 23m 2s

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