email_log: Reset the value of email after email change process.
email_log: Reset the value of email after email change process.

This commit actually needs only user_profile.save() line
but it's more readable with both the lines.

zulip/zulip,hackerkid/zulip,zulip/zulip,rishig/zulip,rishig/zulip,zulip/zulip,showell/zulip,showell/zulip,tommyip/zulip,eeshangarg/zulip,jackrzhang/zulip,hackerkid/zulip,andersk/zulip,mahim97/zulip,brainwane/zulip,tommyip/zulip,synicalsyntax/zulip,hackerkid/zulip,timabbott/zulip,eeshangarg/zulip,punchagan/zulip,synicalsyntax/zulip,punchagan/zulip,rht/zulip,brainwane/zulip,andersk/zulip,eeshangarg/zulip,timabbott/zulip,rishig/zulip,kou/zulip,shubhamdhama/zulip,eeshangarg/zulip,jackrzhang/zulip,brainwane/zulip,mahim97/zulip,punchagan/zulip,eeshangarg/zulip,andersk/zulip,dhcrzf/zulip,showell/zulip,dhcrzf/zulip,timabbott/zulip,hackerkid/zulip,timabbott/zulip,kou/zulip,brainwane/zulip,dhcrzf/zulip,jackrzhang/zulip,mahim97/zulip,hackerkid/zulip,tommyip/zulip,showell/zulip,synicalsyntax/zulip,jackrzhang/zulip,shubhamdhama/zulip,kou/zulip,jackrzhang/zulip,shubhamdhama/zulip,timabbott/zulip,rishig/zulip,hackerkid/zulip,zulip/zulip,jackrzhang/zulip,andersk/zulip,punchagan/zulip,rht/zulip,zulip/zulip,shubhamdhama/zulip,punchagan/zulip,brainwane/zulip,kou/zulip,tommyip/zulip,rishig/zulip,synicalsyntax/zulip,shubhamdhama/zulip,rht/zulip,showell/zulip,dhcrzf/zulip,brainwane/zulip,zulip/zulip,punchagan/zulip,zulip/zulip,rht/zulip,showell/zulip,dhcrzf/zulip,punchagan/zulip,timabbott/zulip,mahim97/zulip,brainwane/zulip,rht/zulip,eeshangarg/zulip,mahim97/zulip,kou/zulip,timabbott/zulip,synicalsyntax/zulip,tommyip/zulip,rishig/zulip,eeshangarg/zulip,synicalsyntax/zulip,hackerkid/zulip,dhcrzf/zulip,rht/zulip,shubhamdhama/zulip,andersk/zulip,andersk/zulip,rht/zulip,tommyip/zulip,shubhamdhama/zulip,synicalsyntax/zulip,dhcrzf/zulip,jackrzhang/zulip,rishig/zulip,kou/zulip,mahim97/zulip,showell/zulip,kou/zulip,tommyip/zulip,andersk/zulip