installer: allow Pseudo Console support to be re-disabled #299
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As noted by @satsuper in git-for-windows/git#2729 (comment), when a user enabled support for Pseudo Consoles and then reinstalled to disable it, by mistake the Pseudo Console support would still be enabled.
The reason? We only write
/etc/git-bash.config
to enable the Pseudo Console support, but not when we disable it (because it is disabled by default, anyway). However, we failed to remove that file upon uninstall/upgrade.