When setting new status message, previous text (if any) is not preserved in text
entry, instead it's always default text for given status. This is painful,
especially when you spot typo in your carefully crafted message

Expected behaviour:
When typing in new message, old one should be available as default text

PS. Just to strike preemptively, I know about presets list, and no, it's not
solution, since it matters primarly for one-shot messages, or exactly when you
realise text you just typed in as one-off would better be on presets list, and
now need to retype it