When exporting with a sample rate other than 44.1 kHz, LB302's filter frequency goes higher than the set value.

Steps to reproduce:

• Drag LB302 to the song editor and make some pattern.
• Set the filter so that its effect is hearable
• Export the project with oversampling or higher sample rate

Expected behavior:
The sound sounds the same as in the editor.

Actual behavior:
The filter frequency is higher than expected.

Tested on current master and 1.2.2 AppImage.