Fix HiDPI text rendering on Windows

win/Audacity.exe.manifest

 <?xml version='1.0' encoding='UTF-8' standalone='yes'?>
-<assembly xmlns='urn:schemas-microsoft-com:asm.v1' manifestVersion='1.0'>
+<assembly xmlns='urn:schemas-microsoft-com:asm.v1' manifestVersion='1.0' xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
   <assemblyIdentity
       version="2.3.0.0"
       processorArchitecture="x86"
@@ -19,4 +19,9 @@
       <assemblyIdentity type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*' />
     </dependentAssembly>
   </dependency>
+  <asmv3:application>
+    <asmv3:windowsSettings xmlns="http://schemas.microsoft.com/SMI/2017/WindowsSettings">
+      <gdiScaling>true</gdiScaling>
+    </asmv3:windowsSettings>
+  </asmv3:application>
 </assembly>