message_scroll: Fix broken call to hide_empty_narrow_message.
message_scroll: Fix broken call to hide_empty_narrow_message.

This was broken when moving the code being called to another file.

This exception caused a pretty weird/nasty bug by interrupting the
message_fetch response handler before it finished updating the
fetch_status data strutures.  The end result was that in views where
the "history limited notice" was displayed, local echo would be broken
a confusing notice would be displayed.

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