formulary: remap deprecated options from keg.

[MikeMcQuaid]

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When reading a building a formula from a keg (rather than e.g. from name) then the deprecation options were not remapped correctly as they are only done in Tab.for_formula and not Tab.for_keg. Ensure that after we’ve created the formula that the used_options are remapped
correctly.

Fixes Homebrew/homebrew-core#7630.

[ilovezfs]

Just to get this on the PR and not just Slack, it seems this has caused the bug discovered in Homebrew/homebrew-core#4258 and fixed in #835 to return.

iMac-TMP:Homebrew joe$ brew install --only-dependencies codequery
==> Installing dependencies for codequery: sip
==> Installing codequery dependency: sip
==> Downloading https://homebrew.bintray.com/bottles/sip-4.18.1.el_capitan.bottle.tar.gz
Already downloaded: /Users/joe/Library/Caches/Homebrew/sip-4.18.1.el_capitan.bottle.tar.gz
==> Pouring sip-4.18.1.el_capitan.bottle.tar.gz
==> Using the sandbox
==> Caveats
The sip-dir for Python is /usr/local/share/sip.
==> Summary
🍺  /usr/local/Cellar/sip/4.18.1: 11 files, 903.7K
iMac-TMP:Homebrew joe$ 

The expected behavior is that it should build sip --with-python3 as specified by qscintilla2, which is a dependency of codequery.