attack preview: show damage and percent sign

* Adds HP damage and '%' sign to attack preview top-line text. (Not sure if you're still maintaining this project at all, but I came across it looking for open-source FFT/TRPG clients and yours is the only respectable one I've found. Beautifully done. This is just the first thing I came across and wanted to try a quick fix for.)
* rough reference: http://lparchive.org/Final-Fantasy-Tactics/Update%2001/67-capture_25122010_232646.png