auth: Remove unused request.verified_email variable.
auth: Remove unused request.verified_email variable.

This has never been used since it was introduced in the very first
version of our Google auth code in April 2013.

showell/zulip,brainwane/zulip,tommyip/zulip,tommyip/zulip,punchagan/zulip,jackrzhang/zulip,showell/zulip,punchagan/zulip,tommyip/zulip,hackerkid/zulip,eeshangarg/zulip,rht/zulip,timabbott/zulip,andersk/zulip,showell/zulip,andersk/zulip,jackrzhang/zulip,rht/zulip,synicalsyntax/zulip,zulip/zulip,andersk/zulip,shubhamdhama/zulip,rht/zulip,jackrzhang/zulip,zulip/zulip,zulip/zulip,dhcrzf/zulip,punchagan/zulip,synicalsyntax/zulip,punchagan/zulip,shubhamdhama/zulip,synicalsyntax/zulip,brainwane/zulip,brainwane/zulip,rht/zulip,hackerkid/zulip,rishig/zulip,hackerkid/zulip,brainwane/zulip,brainwane/zulip,showell/zulip,shubhamdhama/zulip,zulip/zulip,dhcrzf/zulip,zulip/zulip,dhcrzf/zulip,punchagan/zulip,timabbott/zulip,shubhamdhama/zulip,tommyip/zulip,kou/zulip,kou/zulip,timabbott/zulip,showell/zulip,jackrzhang/zulip,rishig/zulip,hackerkid/zulip,zulip/zulip,hackerkid/zulip,dhcrzf/zulip,kou/zulip,jackrzhang/zulip,showell/zulip,eeshangarg/zulip,brainwane/zulip,jackrzhang/zulip,shubhamdhama/zulip,shubhamdhama/zulip,rishig/zulip,tommyip/zulip,punchagan/zulip,eeshangarg/zulip,rishig/zulip,shubhamdhama/zulip,hackerkid/zulip,kou/zulip,synicalsyntax/zulip,rishig/zulip,eeshangarg/zulip,eeshangarg/zulip,timabbott/zulip,punchagan/zulip,andersk/zulip,brainwane/zulip,showell/zulip,timabbott/zulip,andersk/zulip,kou/zulip,dhcrzf/zulip,dhcrzf/zulip,synicalsyntax/zulip,synicalsyntax/zulip,timabbott/zulip,kou/zulip,eeshangarg/zulip,tommyip/zulip,dhcrzf/zulip,kou/zulip,rishig/zulip,hackerkid/zulip,jackrzhang/zulip,tommyip/zulip,andersk/zulip,rht/zulip,rht/zulip,andersk/zulip,rht/zulip,synicalsyntax/zulip,zulip/zulip,timabbott/zulip,eeshangarg/zulip,rishig/zulip