Fix `AudioStreamRandomizer.random_volume_offset_db` not working #13539

Job	Run time
📊 Static checks / Code style, file formatting, and docs	46s
🤖 Android / Template (target=template_release)	24m 5s
🐧 Linux / Editor w/ Mono (target=editor)	29m 2s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	35m 5s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	30m 29s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	31m 20s
🍏 iOS / Template (target=template_release)	9m 33s
🌐 Web / Template (target=template_release)	8m 32s
🍎 macOS / Editor (target=editor, tests=yes)	25m 9s
🐧 Linux / Template w/ Mono (target=template_release)	11m 19s
🍎 macOS / Template (target=template_release)	7m 10s
🐧 Linux / Minimal template (target=template_release, everything disabled)	9m 57s
🏁 Windows / Editor (target=editor, tests=yes)	39m 45s
🏁 Windows / Template (target=template_release)	21m 35s
🪲 Godot CPP / Build and test Godot CPP	11m 27s
	4h 55m 14s

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