Log Message:
Update to 45.4.0

Changelog:
    Fixed "Apply columns to..." did not honor special folders
    Fixed Threading broken when editing message draft, due to loss of Message-ID
    Fixed Mail saved as template copied In-Reply-To and References from original \ 
email.
    Fixed Additional spaces were inserted when drafts were edited.
    Fixed Recipient addresses were shown in red despite being inserted from the \ 
address book in some circumstances.
    Fixed Display name was truncated if no separating space before email address.