Allow zero delta on 'add border' filter

[Jeremy Morton <admin@xxxxxxxxxxxxxx>]

The 'Filters | Decor | Add Border' filter allows a border to be added 
around the current image.  The delta value determines the extent to 
which the base color is changed to create the bevel effect.  When the 
delta value is changed to 0, it automatically jumps back to 1.  However, 
why not allow it to stay at zero, and when it's zero, just add a border 
whose color is identical to the specified base color?  This would allow 
the 'add border' filter to add plain un-beveled borders if the user desires.

--
Best regards,
Jeremy Morton (Jez)
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