When using -e <command> don't save to profile for new tabs.

    Currently using -e <command> will cause all new tabs/windows to run
    <command>.  This patch fixes that such that new tabs/windows will start
    the default profile.

    Patch by Gu Rui <chaos.proton@gmail.com> with minor edit by self.
    FIXED-IN: 4.8
    REVIEW: 102602
    CCBUG: 192212