Cannot handle middle-clicks in controller widgets

[Protonull]

Since yacl displays options within a list, and dev.isxander.yacl3.gui.ElementListWidgetExt overrides boolean isValidMouseClick(int) to accept left clicks and right clicks, but not middle clicks. This could be remedied with:

/*? if >1.20.1 {*/
@Override
/*?}*/
protected boolean isValidMouseClick(int button) {
    return button == InputConstants.MOUSE_BUTTON_LEFT
        || button == InputConstants.MOUSE_BUTTON_RIGHT
        || button == InputConstants.MOUSE_BUTTON_MIDDLE;
}

[Protonull]

Solved with #219