* fix(windows): don't inherit stdin when executing commands
On Windows, inheriting stdin from starship might lead to leaking the
console reference to the command we're executing. `id.exe` supplied with
Git has been observed to disable the ENABLE_VIRTUAL_TERMINAL_PROCESSING
console flag if it inherits stdin -- leading to Windows Terminal not
processing ANSI escape sequences.
This change fixes#2254 by explicitly disabling stdin inheritance.
The fix was suggested by David Knaack.
* fix(username): don't call `id -u` on Windows
This was done to check if user is root by comparing the UID to 0. Windows
does not have a concept of UID 0 anyway, so it's pointless to call `id.exe`
(which is installed with MSYS2 or Git, for example).
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