Fix macOS Toolbar Button color

* Correct color setting only if dark mode is enabled

src/gui/MainWindow.cpp

@@ -41,6 +41,10 @@
 #include "keys/FileKey.h"
 #include "keys/PasswordKey.h"
 
+#ifdef Q_OS_MACOS
+#include "macutils/MacUtils.h"
+#endif
+
 #ifdef WITH_XC_UPDATECHECK
 #include "gui/MessageBox.h"
 #include "gui/UpdateCheckDialog.h"
@@ -370,6 +374,9 @@ MainWindow::MainWindow()
 
 #ifdef Q_OS_MACOS
     setUnifiedTitleAndToolBarOnMac(true);
+    if (macUtils()->isDarkMode()) {
+        setStyleSheet("QToolButton {color:white;}");
+    }
 #endif
 
 #ifdef WITH_XC_UPDATECHECK