refactor: Remove obsolete .message-right.
refactor: Remove obsolete .message-right.

This is an obsolote css class in zulip.css.

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