Hide "Send message as [user]..." for single account setups

[gempir]

What should be added?
When a user only has one account configured it should not show the input placeholder "Send message as [user]..."

Why should it be added?
I have seen multiple different people complain about this new feature and even going so far as deciding to stay on an older version because of it.

Visually it makes the input look more closer to a chat line, so that might be a reason it's so annoying to some people.

Too avoid adding another setting just hiding it for single user setups might be best, because then the message is kind of redundant anyway.

[auxtinn]

i think if anything this setting should be optional. i, myself do like seeing that i’m on my account and that oauth hasn't expired or something like that. idk, just my personal preference...

[leon-richardt]

Whatever way we decide on this, I don't think it's worth adding a setting for

[auxtinn]

Whatever way we decide on this, I don't think it's worth adding a setting for

i suppose not but personally i wouldn't like for this to be gone through with..

[zneix]

@AustinHolderr this has been discussed to limits in #2305 already.

[ALazyMeme]

This seems like a fair solution to the issue. I personally don't care if it's there or not, but for the people who do (for whatever reason), this would be a good addition.

[Mm2PL]

I'd personally prefer using the channel name instead of user name. 👀