Modified launcher file for reflecting change of checking interval's argument name (-p => -i)

python/labsync-tray.desktop

 [Desktop Entry]
 Name=Labsync Tray
 Comment=Notification tray application for labsync (/opt software updates)
-Exec=/usr/local/sbin/labsync-tray.py -p 30
+Exec=/usr/local/sbin/labsync-tray.py -i 30
 Terminal=false
 Type=Application
 Icon=