Change dark mode when run as AUv3

MacOSX and iOS
1

Currently DarkModeSettingListener is only invoked when run as Standalone. Similarly Desktop::isDarkModeActive will return the value set at load time instead of current settings. Attached is a patch that allows for hot-swapping dark mode also when run as a AUv3 plug-in.

diff --git a/modules/juce_gui_basics/native/juce_ios_Windowing.mm b/modules/juce_gui_basics/native/juce_ios_Windowing.mm
index 6249e0dec..44a47ec4c 100644
--- a/modules/juce_gui_basics/native/juce_ios_Windowing.mm
+++ b/modules/juce_gui_basics/native/juce_ios_Windowing.mm
@@ -736,7 +736,19 @@ Image juce_createIconForFile (const File&)
 {
    #if defined (__IPHONE_12_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_12_0
     if (@available (iOS 12.0, *))
+    {^M
+        if (ComponentPeer::getNumPeers() > 0)^M
+        {^M
+            auto peer = ComponentPeer::getPeer(0);^M
+            if (peer)^M
+            {^M
+                auto view = (UIView *)peer->getNativeHandle();^M
+                return [[view traitCollection] userInterfaceStyle] == UIUserInterfaceStyleDark;^M
+            }^M
+        }^M
+^M
         return [[[UIScreen mainScreen] traitCollection] userInterfaceStyle] == UIUserInterfaceStyleDark;
+    }^M
    #endif
 
     return false;