wix: pre-check the 'I approve this license' checkbox

This is simply a convenience to the user, they can click next until the
installer goes away.  Optimally, the checkbox would be hidden or removed,
but that requires rewriting the UI.

contrib/wix/mercurial.wxs

@@ -37,6 +37,9 b''
     <Property Id='INSTALLEDMERCURIALPRODUCTS' Secure='yes'></Property>
     <Property Id='REINSTALLMODE'>amus</Property>
 
+    <!--Auto-accept the license page-->
+    <Property Id='LicenseAccepted'>1</Property>
+
     <Directory Id='TARGETDIR' Name='SourceDir'>
       <Directory Id='ProgramFilesFolder' Name='PFiles'>
         <Directory Id='INSTALLDIR' Name='Mercurial'>