Don't adjust the font to DPI if the window isn't created yet

This is at best useless, as we can't get the correct DPI to use before
the window is created anyhow.

See #22193.

src/msw/window.cpp

@@ -4891,7 +4891,13 @@ double wxWindowMSW::GetDPIScaleFactor() const
 
 void wxWindowMSW::WXAdjustFontToOwnPPI(wxFont& font) const
 {
-    font.WXAdjustToPPI(GetDPI());
+    // We don't need to adjust the font if the window hasn't been created yet,
+    // as our MSWUpdateFontOnDPIChange() will be called when it is created if a
+    // non-default DPI is used and it will be done then, so skip doing it now,
+    // especially because we can't get the correct DPI in GetDPI() anyhow
+    // without a valid HWND.
+    if ( GetHwnd() )
+        font.WXAdjustToPPI(GetDPI());
 }
 
 void wxWindowMSW::MSWUpdateFontOnDPIChange(const wxSize& newDPI)