fix(dlgprefwaveform): Fix `-Wdangling-reference` on GCC 14.1.1 #1894

Job	Run time
Ubuntu 22.04 (gcc)	9m 43s
Ubuntu 22.04 (Qt 6.2, gcc)	12m 19s
macOS 12 x64	12m 3s
macOS 12 arm64	7m 25s
Windows 2019 (MSVC)	16m 55s
Update manifest file on download server	33s
	58m 58s

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