gui: Look for icon file in current dir on Windows
gui: Look for icon file in current dir on Windows

Similar to the previous change for *.ui.  This makes the app's icon show
up on the taskbar and on the window menu (alt-space).

Signed-off-by: Kevin Cernekee <3105dbb3dd63fbb4f6371cfb04adc6726f76c56b@gmail.com>

mtmiller/stoken,mtmiller/stoken,mtmiller/stoken,cernekee/stoken,mtmiller/stoken,cernekee/stoken,cernekee/stoken,cernekee/stoken