Allow export and save as function able to replace the same file name

[Trí Phạm]

Hello, Write experience have been great so far, the app is really fast and i love SVG file extension, it give me a secure feeling about long term journey. The only things messing with me right now is save as and export doesn't allow replace the same file name, i know that i can delete the current file and go on but this process is quirky and slow compare to others app such as xournal++, when i export to pdf with the same file name, it just call a new window to make sure i want to replace it then i press it, no need to open a new folder manager and then delete it. Thanks for reading!