message view: Fix position of `loading_older_messages_indicator`.
message view: Fix position of `loading_older_messages_indicator`.

For narrows where the `.all-messages-search-caution` or
`.history-limited-box` are visible the indicator is not
aligned with `top-messages-logo`.
Now the indicator is rendered in it's appropriate position
instead of overlapping with the text.

andersk/zulip,brainwane/zulip,rht/zulip,zulip/zulip,kou/zulip,andersk/zulip,kou/zulip,punchagan/zulip,zulip/zulip,synicalsyntax/zulip,brainwane/zulip,hackerkid/zulip,andersk/zulip,punchagan/zulip,shubhamdhama/zulip,punchagan/zulip,hackerkid/zulip,showell/zulip,timabbott/zulip,punchagan/zulip,hackerkid/zulip,eeshangarg/zulip,andersk/zulip,rht/zulip,eeshangarg/zulip,zulip/zulip,shubhamdhama/zulip,zulip/zulip,synicalsyntax/zulip,shubhamdhama/zulip,punchagan/zulip,eeshangarg/zulip,synicalsyntax/zulip,kou/zulip,andersk/zulip,rht/zulip,hackerkid/zulip,eeshangarg/zulip,synicalsyntax/zulip,kou/zulip,brainwane/zulip,showell/zulip,andersk/zulip,hackerkid/zulip,zulip/zulip,timabbott/zulip,kou/zulip,brainwane/zulip,rht/zulip,shubhamdhama/zulip,eeshangarg/zulip,shubhamdhama/zulip,eeshangarg/zulip,eeshangarg/zulip,zulip/zulip,synicalsyntax/zulip,synicalsyntax/zulip,kou/zulip,punchagan/zulip,rht/zulip,shubhamdhama/zulip,hackerkid/zulip,rht/zulip,showell/zulip,timabbott/zulip,kou/zulip,timabbott/zulip,brainwane/zulip,punchagan/zulip,brainwane/zulip,synicalsyntax/zulip,andersk/zulip,timabbott/zulip,hackerkid/zulip,rht/zulip,showell/zulip,showell/zulip,timabbott/zulip,zulip/zulip,timabbott/zulip,showell/zulip,shubhamdhama/zulip,showell/zulip,brainwane/zulip