Fix the inverted condition for USE_LEGACY_ZOOM_FACTOR

[HEIHUAa]

Fix the inverted condition for USE_LEGACY_ZOOM_FACTOR.
For nearly a year, the value set for USE_LEGACY_ZOOM_FACTOR has been correct, but the final code had the logic reversed. When USE_LEGACY_ZOOM_FACTOR was disabled, it actually used the 0.1.0 calculation method, while enabling it used the new one instead.

[HEIHUAa]

Additionally, I would like to check whether DEFAULT_SOUND_TIME_SCALED_PITCH seems to be inverted as well. In version 1.0.1, it was enabled by default to follow the pitch, while in the new version it is disabled. If this is confirmed to be a mistake, it could be changed to: if (DEFAULT_SOUND_TIME_SCALED_PITCH == null) DEFAULT_SOUND_TIME_SCALED_PITCH = MOD_API_VERSION < 3;