settings CSS : Fix 'user-avatar-source' text reflow bug.
settings CSS : Fix 'user-avatar-source' text reflow bug.

When we move the avatar upload widget to `image_upload_widget.hbs` file
the CSS `position:absolute` for `avatar-source` is preserved.
by removing CSS `position:absolute` we can fix the bug.

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