Fix for #65 (checkmark icon rendering glitches)

Hi, I have enclosed a fix for bug #65.

There were some minor rendering issues with the green checkmark that is displayed on top of icons of installed applications.

chocolate-doom and vidalia icons before:
![](https://sites.google.com/site/bl0ckeduserssoftware/before_fix.png?attredirects=0&d=1)
![](https://sites.google.com/site/bl0ckeduserssoftware/before2.png?attredirects=0&d=1)

chocolate-doom and vidalia icons after:
![](https://sites.google.com/site/bl0ckeduserssoftware/sizefix.png?attredirects=0&d=1)
![](https://sites.google.com/site/bl0ckeduserssoftware/after2.png?attredirects=0&d=1)

best regards