fix(slay-the-spire-like): pass correct sourceEntityId in instant

triggers

Simplify the sourceEntityId logic to use the context value directly.

src/samples/slay-the-spire-like/data/desert/triggers/instant.ts

@@ -95,10 +95,7 @@ export function addInstantEffectTriggers(triggers: Triggers) {
       await triggers.onDamage.execute(ctx.game, {
         entityId: ctx.entityId,
         amount: ctx.stacks,
-        sourceEntityId:
-          (ctx.sourceEntityId ?? ctx.entityId === "player")
-            ? undefined
-            : "player",
+        sourceEntityId: ctx.sourceEntityId,
       });
     } else if (ctx.effect.id === "draw") {
       await triggers.onDraw.execute(ctx.game, { count: ctx.stacks });