email tooltip: Adjust background color of email toolip in dark-mode.
email tooltip: Adjust background color of email toolip in dark-mode.

This commit adjust the email tooltip of popover in dark-mode.

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