Fix typo in callbacks (#4122)

## Summary

This PR fixes a typo: calbacks → callbacks.

## Test plan

Run the Example app.

src/reanimated2/initializers.ts

@@ -128,7 +128,7 @@ function setupRequestAnimationFrame() {
         global.__frameTimestamp = undefined;
       });
     }
-    // Reanimated currently does not support cancelling calbacks requested with
+    // Reanimated currently does not support cancelling callbacks requested with
     // requestAnimationFrame. We return -1 as identifier which isn't in line
     // with the spec but it should give users better clue in case they actually
     // attempt to store the value returned from rAF and use it for cancelling.

src/reanimated2/threads.ts

@@ -13,20 +13,20 @@ let _runOnUIQueue: Array<[ComplexWorkletFunction<any[], any>, any[]]> = [];
 export function setupSetImmediate() {
   'worklet';
 
-  let immediateCalbacks: Array<() => void> = [];
+  let immediateCallbacks: Array<() => void> = [];
 
   // @ts-ignore – typescript expects this to conform to NodeJS definition and expects the return value to be NodeJS.Immediate which is an object and not a number
   global.setImmediate = (callback: () => void): number => {
-    immediateCalbacks.push(callback);
+    immediateCallbacks.push(callback);
     return -1;
   };
 
   global.__flushImmediates = () => {
-    for (let index = 0; index < immediateCalbacks.length; index += 1) {
+    for (let index = 0; index < immediateCallbacks.length; index += 1) {
       // we use classic 'for' loop because the size of the currentTasks array may change while executing some of the callbacks due to setImmediate calls
-      immediateCalbacks[index]();
+      immediateCallbacks[index]();
     }
-    immediateCalbacks = [];
+    immediateCallbacks = [];
   };
 }