Backport "Hide text tool" feature to 0.0.9

[malte-v]

Hi, thanks for making these wonderful hacks! Is there any chance you could backport the "hide text tool" feature introduced in v0.0.10 to version 0.0.9 of the hacks? I've found that firmware version 3.10 introduced quite a lot of bugs and instability which have not been fixed in subsequent versions (such as written text randomly disappearing, switching writing tools sometimes taking several seconds, etc), so I've downgraded back to 3.9 and I am quite happy with this decision. But unfortunately I can't use v0.0.10 of the hacks anymore, so I'm unable to remove the text tool button, which I never use but keep hitting accidentally as the button is located between the pen and eraser. That's why I would very much appreciate a backport of this feature to rm-hacks v0.0.9 :)

[mb1986]

I'll focus on the new versions first. Nonetheless, it is an easy one, so maybe...