c5dc0b2f39 disabled send button on composer sent.
But this is only needed for chatter composer, other composers directly
send the message and are not refreshed asynchronously.
So for other composer, the send button worked one time but then was
disabled and the only way to sent was ENTER (on basic composer) or
CTRL+ENTER (on extended composer).
With this fix, disabling the button is done only for chatter composer.
11.0 backport of 12.0 #28474
issue found when checking opw-1904029
closes#28506
Nicolas Lempereur
fc70c35195