UI: stop scaling at 1.5 on a desktop (a 1440p or ultrawide screen made everything twice as big); the TV mode still scales to the screen

ui/qml/Main.qml

@@ -36,7 +36,9 @@ ApplicationWindow {
     // own shape, so the bars reach the edges and the content fills it.
     Item {
         id: stage
-        readonly property real k: Math.min(win.width / 1280, win.height / 720)
+        // On a desktop (a window, however large) the scale stops at 1.5: a 1440p or ultrawide monitor would otherwise show
+        // everything twice as big. The TV mode (--fullscreen, gamescope) scales to the screen: it is read from the couch.
+        readonly property real k: Math.min(win.width / 1280, win.height / 720, win.fullscreen ? Infinity : 1.5)
         width: win.width / k; height: win.height / k
         transformOrigin: Item.TopLeft
         scale: k