zulip.scss: Use scss nesting syntax for .email_tooltip.
zulip.scss: Use scss nesting syntax for .email_tooltip.

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