Fix multiplayer player count color in dark themes | Temp fix until #12744: Add green color for counts > 0 and < max_players - 1 (#12930)

* fix intended player count color in dark themes

* Refactor

* Change to green color for white and dark themes

* Add const to the colors and extra name for green color

src/yuzu/multiplayer/lobby_p.h

@@ -202,12 +202,19 @@ public:
         case Qt::ForegroundRole: {
             auto members = data(MemberListRole).toList();
             auto max_players = data(MaxPlayerRole).toInt();
+            const QColor room_full_color(255, 48, 32);
+            const QColor room_almost_full_color(255, 140, 32);
+            const QColor room_has_players_color(32, 160, 32);
+            const QColor room_empty_color(128, 128, 128);
+
             if (members.size() >= max_players) {
-                return QBrush(QColor(255, 48, 32));
+                return QBrush(room_full_color);
             } else if (members.size() == (max_players - 1)) {
-                return QBrush(QColor(255, 140, 32));
+                return QBrush(room_almost_full_color);
             } else if (members.size() == 0) {
-                return QBrush(QColor(128, 128, 128));
+                return QBrush(room_empty_color);
+            } else if (members.size() > 0 && members.size() < (max_players - 1)) {
+                return QBrush(room_has_players_color);
             }
             // FIXME: How to return a value that tells Qt not to modify the
             // text color from the default (as if Qt::ForegroundRole wasn't overridden)?