Fix Waveform generation failing when using "no sound" device

[peppy]

Closes ppy/osu#18479 (probably... unless there are other cases. fine to close until it comes up again).

[frenzibyte]

I looked at the issue thread and noticed there was logs attached, and it had the following in the log:

2022-05-29 13:27:39 [verbose]: 🔈 BASS initialised
2022-05-29 13:27:39 [verbose]: BASS version:           2.4.16.7
2022-05-29 13:27:39 [verbose]: BASS FX version:        2.4.12.6
2022-05-29 13:27:39 [verbose]: BASS MIX version:       2.4.11.1
2022-05-29 13:27:39 [verbose]: Device:                 No sound
2022-05-29 13:27:39 [verbose]: Driver:
2022-05-29 13:27:39 [verbose]: Update period:          5 ms
2022-05-29 13:27:39 [verbose]: Device buffer length:   10 ms
2022-05-29 13:27:39 [verbose]: Playback buffer length: 100 ms
2022-05-29 13:27:39 [verbose]: 🔈 BASS initialised
2022-05-29 13:27:39 [verbose]: BASS version:           2.4.16.7
2022-05-29 13:27:39 [verbose]: BASS FX version:        2.4.12.6
2022-05-29 13:27:39 [verbose]: BASS MIX version:       2.4.11.1
2022-05-29 13:27:39 [verbose]: Device:                 Default
2022-05-29 13:27:39 [verbose]: Driver:
2022-05-29 13:27:39 [verbose]: Update period:          5 ms
2022-05-29 13:27:39 [verbose]: Device buffer length:   10 ms
2022-05-29 13:27:39 [verbose]: Playback buffer length: 100 ms

I tested locally on Windows by disabling all sound devices and this is what I'm seeing instead:

2022-07-18 08:07:47 [verbose]: 🔈 BASS initialised
2022-07-18 08:07:47 [verbose]: BASS version:           2.4.16.7
2022-07-18 08:07:47 [verbose]: BASS FX version:        2.4.12.6
2022-07-18 08:07:47 [verbose]: BASS MIX version:       2.4.11.1
2022-07-18 08:07:47 [verbose]: Device:                 No sound
2022-07-18 08:07:47 [verbose]: Driver:
2022-07-18 08:07:47 [verbose]: Update period:          5 ms
2022-07-18 08:07:47 [verbose]: Device buffer length:   10 ms
2022-07-18 08:07:47 [verbose]: Playback buffer length: 100 ms
2022-07-18 08:07:47 [verbose]: 🔈 BASS initialised
2022-07-18 08:07:47 [verbose]: BASS version:           2.4.16.7
2022-07-18 08:07:47 [verbose]: BASS FX version:        2.4.12.6
2022-07-18 08:07:47 [verbose]: BASS MIX version:       2.4.11.1
2022-07-18 08:07:47 [verbose]: Device:                 No sound
2022-07-18 08:07:47 [verbose]: Driver:
2022-07-18 08:07:47 [verbose]: Update period:          5 ms
2022-07-18 08:07:47 [verbose]: Device buffer length:   10 ms
2022-07-18 08:07:47 [verbose]: Playback buffer length: 100 ms

So I'm not 100% sure if it's really about "no sound", but probably fine to close this until it comes up again.