Implement missing method for VLCVideoEffectsWindowController

../../extras/package/macosx/../../../modules/gui/macosx/panels/VLCVideoEffectsWindowController.m:55:17: warning: method definition for 'enableAdjustBrightnessThreshold:' not found [-Wincomplete-implementation]
@implementation VLCVideoEffectsWindowController
                ^
../../extras/package/macosx/../../../modules/gui/macosx/panels/VLCVideoEffectsWindowController.h:174:1: note: method 'enableAdjustBrightnessThreshold:' declared here
- (IBAction)enableAdjustBrightnessThreshold:(id)sender;
^

Somehow this is missing, I have no idea why or when it was deleted.

/cc @fkuehne @dfuhrmann

Edited Apr 11, 2022 by Marvin Scholz

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