Settings: rename so it looks like a group of related settings

settings.conf

@@ -154,7 +154,7 @@ dont-chroot: false
 # Calamares will complain if this is not explicitly set.
 # oem-setup: true
 
-# If this is set to true, the "Cancel" button will be disabled.
+# If this is set to true, the "Cancel" button will be disabled entirely.
 # This can be useful if when e.g. Calamares is used as a post-install 
 # configuration tool and you require the user to go through all the 
 # configuration steps.
@@ -167,4 +167,4 @@ disable-cancel: false
 # If this is set to true, the "Cancel" button will be disabled once
 # you start the 'Installation', meaning there won't be a way to cancel
 # the Installation until it has finished or installation has failed.
-dont-cancel: false
+disable-cancel-during-exec: false