Fix CSS for avatar upload widget

[timabbott]

The "Uploading..." text appears in a weird place; I think probably we can just remove the text, given that we have a loading spinner anyway.

There may be a similar issue with the organization upload widget.

[zulipbot]

Hello @zulip/server-misc members, this issue was labeled with the area: uploads label, so you may want to check it out!

[manjithd2]

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[manjithd2]

Hi, @timabbott I am working on this. I'll clean up my commit and give a PR soon!

[timabbott]

@manjithd2 you should try the approach of just modifying loading.make_indicator to not pass text in this case and see how that looks.