quirk: deal with Exchange's excessive space

[nbdd0121]

Microsoft Exchange responds STATUS with a trailing space, which is not RFC compliant.

This is similarly worked around in Ruby's imap library: https://bugs.ruby-lang.org/issues/13649

[coveralls]

Pull Request Test Coverage Report for Build 8310690901

Details

• 11 of 11 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.007%) to 92.488%

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Totals
Change from base Build 8236496091:	0.007%
Covered Lines:	10047
Relevant Lines:	10863

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💛 - Coveralls

[duesee]

Perfect. Thank you very much, @nbdd0121!