More spelling errors

Signed-off-by: Ran Benita <ran234@gmail.com>
text: clean up and fix the *MaskText functions

The snprintf trick that LedStateText and ControlMaskText do cannot work,
because you can't use the buffer as an argument to write to itself!
(posix at least has 'restrict' there). So those two actually never
worked for more than one value (i.e. with a +).

Fix that, and do the same cleanup to ModMaskText. Now we have 3
functions which look exactly the same, oh well.

Also increase the context text buffer size, you never know.

Signed-off-by: Ran Benita <ran234@gmail.com>