refactor: Simplify title generation logic in `NoteViewModel` #1934

Job	Run time
Build (Unit-tests & Android-Lint)	5h 16m 29s
Android UI-tests on emulator (23, default)	9m 21s
Android UI-tests on emulator (32, default)	7m 17s
Android UI-tests on emulator (28, default)	7m 4s
Android UI-tests on emulator (24, default)	7m 56s
Android UI-tests on emulator (27, default)	7m 23s
Android UI-tests on emulator (31, default)	8m 25s
Android UI-tests on emulator (25, default)	7m 58s
Android UI-tests on emulator (30, default)	7m 44s
Android UI-tests on emulator (29, default)	7m 26s
Android UI-tests on emulator (26, default)	7m 55s
Android UI-tests on emulator (35, default)	10m 25s
Android UI-tests on emulator (33, default)	7m 30s
Android UI-tests on emulator (34, default)	7m 40s
Android UI-tests on emulator (36, default)	7m 20s
	7h 7m 53s

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