editor: fix string ref passing through lambda when opening with file picker

Editor/Editor.cpp

@@ -3704,7 +3704,7 @@ void EditorComponent::RegisterRecentlyUsed(const std::string& filename)
 	contentBrowserWnd.RefreshContent();
 }
 
-void EditorComponent::Open(const std::string& filename)
+void EditorComponent::Open(std::string filename)
 {
 	std::string extension = wi::helper::toUpper(wi::helper::GetExtensionFromFileName(filename));
 

Editor/Editor.h

@@ -145,7 +145,7 @@ public:
 	size_t maxRecentFolders = 5;
 	void RegisterRecentlyUsed(const std::string& filename);
 
-	void Open(const std::string& filename);
+	void Open(std::string filename);
 	void Save(const std::string& filename);
 	void SaveAs();
 	bool deleting = false;