Save Button not shown when some options are set by constant

Hey,

I think I found a few bugs:

First, it doesn’t hide the Settings screen when I use:
define( 'CONTEXTUAL_ADMINBAR_SETTINGS', 0 )
It still displays it under “Tools” and is accessible. I have to set the value to “false” to hide it.

The Second issue:
When I set the values for color and message by constants the “save button” is missing. This is a problem because there is no constant for user roles so I have to use the options and need the save button.