message_list: Fix unnecessary work re-rendering all_msg_list.
message_list: Fix unnecessary work re-rendering all_msg_list.

Since all_msg_list is never displayed, there's no reason to do work
re-rendering it in these code paths.

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