chore: add breakdown item if gainMultiplier anything other than 1

Author: Miodec

backend/__tests__/api/controllers/result.spec.ts

@@ -631,6 +631,7 @@ describe("result controller test", () => {
         xp: 0,
         dailyXpBonus: false,
         xpBreakdown: {
+          configMultiplier: 0,
           accPenalty: 28,
           base: 20,
           incomplete: 5,

backend/src/api/controllers/result.ts

@@ -825,7 +825,7 @@ async function calculateXp(
   const totalXp =
     Math.round((xpAfterAccuracy + incompleteXp) * gainMultiplier) + dailyBonus;
 
-  if (gainMultiplier > 1) {
+  if (gainMultiplier !== 1) {
     // breakdown.push([
     //   "configMultiplier",
     //   Math.round((xpAfterAccuracy + incompleteXp) * (gainMultiplier - 1)),