The radial control operator is commonly used for setting sculpt brush Size and Strength
settings. However, when using it, it can often be difficult to remember which hotkey
is responsible for which setting, meaning that you can often accidentally modify the
wrong setting without knowing it (or even what new value you've set it to).
This commit makes it so that the property name and the current value are always shown
on the header. Previously this info was only shown when the doing numeric input.
(It also fixes a bug where the numeric input print would hang around even after it
wasn't being used).
Joshua Leung
9815262444