Update desktop-appimage.vtl

Author: fvarrui

src/main/resources/linux/desktop-appimage.vtl

@@ -3,7 +3,7 @@ Name=${info.displayName}
 GenericName=${info.displayName}
 Comment=${info.description}
 Exec=${info.name} %U
-Icon=${info.name}.png
+Icon=${info.name}
 Terminal=false
 Type=Application
 StartupNotify=true