QPrinter::PdfFormat causes some fonts to be doubly-scaled when using DirectWrite font engine

Steps to reproduce

1. Set your display scaling to 100%
2. Open the "Text Edit" example (https://doc.qt.io/qt-6/qtwidgets-richtext-textedit-example.html) and load the attached HTML document.
3. Visually inspect the text in the QTextEdit on screen.
4. Click "File" > "Print..." and select "Microsoft Print to PDF". Print the PDF document and visually inspect it in a PDF viewer.
5. Click "File" > "Export PDF...". Print the PDF document and visually inspect it in a PDF viewer.
6. Close the example application.
7. Set your display scaling to 200% (OR, run the application with -platform windows:fontengine=directwrite) and repeat steps #2 - #6.

Notes:

• Step #1 forces the use of the GDI font engine; Step #7 forces the use of the DirectWrite font engine
• Step #4 causes QPrinter to invoke the OS' PDF printer; Step #5 causes QPrinter to invoke Qt's internal PDF printer.

Outcomes

• Correct outcome (correct.png): The "SITKA" text is a bit smaller than the "ARIAL" text. The "SITKA" text has good kerning.
• Wrong outcome (wrong.png): The "SITKA" text is a bit bigger than the "ARIAL" text. The "SITKA" text has bad kerning – the letters touch each other.

Notes

• Most fonts aren't affected by this issue. Some, like Sitka Text, are.
• Qt 5.15 also displays this issue if  `QGuiApplication::setAttribute(Qt::AA_EnaableHighDpiScaling);` is set.