refactor: improved triangleVertices readability

lib/game/components/sling_shot.dart

@@ -45,11 +45,20 @@ class SlingShot extends BodyComponent {
     // vertex.
     // Something as: y = -size.y * math.cos(angle)
     const additionalIncrement = 2;
-    final triangleVertices = [
-      Vector2(_side.isLeft ? 0 : size.x, 0),
-      Vector2(_side.isLeft ? 0 : size.x, -size.y),
+    final triangleVertices = _side.isLeft
+        ? [
+            Vector2(0, 0),
+            Vector2(0, -size.y),
             Vector2(
-        _side.isLeft ? size.x : 0,
+              size.x,
+              -size.y - additionalIncrement,
+            ),
+          ]
+        : [
+            Vector2(size.x, 0),
+            Vector2(size.x, -size.y),
+            Vector2(
+              0,
               -size.y - additionalIncrement,
             ),
           ];