Fix UnbidDummy initialization

Author: german77

include/prim/seadDelegate.h

@@ -580,11 +580,17 @@ class AnyDelegateR
     class UnbindDummy final : public Base::Interface_
     {
     public:
+        UnbindDummy() {}
         R invoke() override { return {}; }
 #if SEAD_DELEGATE_ISNODUMMY
         bool isNoDummy() const override { return false; }
 #endif
+    private:
+        s32 mUnk = 1;
     };
+
+    AnyDelegateR() {}
+
     using Base::Base;
     using Base::operator=;
 };