StdinReader: Remove throttling on exception

Introducing the throttling unfortunately has a negative side-effect: it
delays all stdin processing, including EOF detection, which can cause
confusion the previous commit tries to fix.

The only benefit of the throttling is to prevent 100% CPU usage when a
lot of garbage is provided on xmobar stdin. We still don't know where
that garbage comes from in https://github.com/jaor/xmobar/issues/438, or
rather why there's more than a handful of lines of such garbage. @psibi
has since fixed his setup to not produce that garbage, and no one else
ever reported such a problem, so it's probably safe to ignore it for
now.

Should anyone ever encounter that again, feel free to ping me, even in
the middle of the night, to help debug this.

Fixes: 7759df11f746 ("StdinReader: Improve exception handling")
Fixes: b7a3d6745817 ("Avoid busy looping by not catching all exceptions")

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