macosx: Include NSAppearanceNameVibrantDark in dark mode detection, fixing borked labels

In master, some labels are coloured incorrectly due to a faulty check for dark mode which doesn't account for NSAppearanceNameVibrantDark. This PR adds this appearance to the dark mode check.

Fixed:

Prior to fix:

Signed-off-by: Claudio Cambra claudio.cambra@gmail.com

modules/gui/macosx/extensions/NSView+VLCAdditions.m

@@ -30,7 +30,8 @@
 - (BOOL)shouldShowDarkAppearance
 {
     if (@available(macOS 10_14, *)) {
-        if ([self.effectiveAppearance.name isEqualToString:NSAppearanceNameDarkAqua]) {
+        if ([self.effectiveAppearance.name isEqualToString:NSAppearanceNameDarkAqua] || 
+        [self.effectiveAppearance.name isEqualToString:NSAppearanceNameVibrantDark]) {
             return YES;
         }
     }