Bug#403957: small clarification to gamma text

[Kees Cook]

Package: abuse-frabs
Version: 2.10-7
Severity: minor
Tags: patch

This is a very small change to help clarify the language used to 
describe what to do at the Gamma Correction dialog, which some people 
find confusing.  e.g. the Ubuntu bug report:
https://launchpad.net/distros/ubuntu/+source/abuse-frabs/+bug/76579

Patch attached...

-- 
Kees Cook                                            @outflux.net