Revert "windows installer: disallow downgrades, allow upgrades"

This reverts commit 4b9ae03bc203fb6612af5a76515da76dd7e67161.

dist/win/resources/overrides.wxi

@@ -1,27 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Stub by design -->
-
-<!--
-overrides.wxi is a placeholder to set/alter WiX variables referenced from default
-main.wxs file.
-
-Put custom overrides.wxi in resource directory to replace this default file.
-
-Override default overrides.wxi if configuring of msi installers through jpackage
-command line is not sufficient.
-
-WiX variables referenced from default main.wxs that can be altered in custom overrides.wxi:
-
-- JpProductLanguage
-Value of `Language` attribute of `Product` WiX element. Default value is 1033.
-
-- JpInstallerVersion
-Value of `InstallerVersion` attribute of `Package` WiX element. Default value is 200.
-
-- JpCompressedMsi
-Value of `Compressed` attribute of `Package` WiX element. Default value is `yes`.
--->
-<?define JpAllowDowngrades="no" ?>
-<?define JpAllowUpgrades="yes" ?>
-
-<Include/>