Fixed DLL compilation of juce_tracktion_marketplace

modules/juce_tracktion_marketplace/marketplace/juce_OnlineUnlockForm.cpp

@@ -112,6 +112,8 @@ struct OnlineUnlockForm::OverlayComp  : public Component,
     Spinner spinner;
     OnlineUnlockStatus::UnlockResult result;
     String email, password;
+
+    JUCE_LEAK_DETECTOR (OnlineUnlockForm::OverlayComp)
 };
 
 static juce_wchar getDefaultPasswordChar() noexcept