Revert "Take DST into account when locating TimeZone from Numeric."

Reverting this as it's not the implementation that we would like it to be.
This is being used inside of ActiveSUpport::TimeZone[] and it's unaware
of the context in which to find the timezone period so the timezone found
changes depending on whether DST is in effect for the current period.
This means that `'2001-01-01'.in_time_zone(-9)` changes from winter/summer
even though it's the same date that we're trying to convert.

Since finding timezones by numeric offsets is a bit hit and miss we should
introduce a new API for finding them which supplies the date context in
which we want to search and we should probably also deprecate the finding
of timezones via the [] method, though this needs further discussion.

This reverts commit 2cc2fa3633edd96773023c6b09d07c7b9d9b841d.

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