fix(Android): apply numberOfPointers config to the pointer requirement in LongPressGestureHandler (#4253)

## Description

Fixes #4252

On Android, the `numberOfPointers` config of the LongPress gesture has
been silently ignored since 2.26.0: a gesture configured with
`Gesture.LongPress().numberOfPointers(3)` activates after a
**single-pointer** long press, and can never activate with the
configured pointer count (the second pointer trips `currentPointers >
numberOfPointersRequired` and fails the handler). iOS is unaffected,
since the prop maps to
`UILongPressGestureRecognizer.numberOfTouchesRequired`.

The cause is a one-line mix-up introduced by the factory refactor in
2.26.0. The factory's `updateConfig` assigns the config value to
`handler.numberOfPointers`, which resolves to the inherited
`GestureHandler.numberOfPointers` — the live pointer-count used for
event payloads, overwritten with `event.pointerCount` on every motion
event. The field that actually gates activation,
`numberOfPointersRequired`, stays at its default of `1` and is never
written from config. Before 2.26.0, the module factory called
`handler.setNumberOfPointers(...)`, which set `numberOfPointersRequired`
correctly.

This PR routes the config value to `numberOfPointersRequired`, restoring
the pre-2.26 behavior. The private-field access from the nested
`Factory` matches the existing `maxDist` assignment directly above.

## Test plan

- Applied this same one-liner to 2.28.0 via patch-package in an RN
0.81.5 (Expo 54, new architecture, Hermes) app that uses
`Gesture.LongPress().numberOfPointers(3)` as a global gesture, and
verified on an Android device:
- three-pointer long press now activates the gesture (previously never
fired)
- single-pointer long press no longer activates it (previously fired
after ~500 ms)
- gestures with the default single pointer (no `numberOfPointers` set)
are unaffected
- Verified iOS behavior is unchanged (the fix doesn't touch the iOS
path)
- Repro snippet:
https://gist.github.com/prashanFOMO/ad838ce8a3c77c59759b8583fe8d3393

Author: prashanFOMO

packages/react-native-gesture-handler/android/src/main/java/com/swmansion/gesturehandler/core/LongPressGestureHandler.kt

@@ -199,7 +199,7 @@ class LongPressGestureHandler(context: Context) : GestureHandler() {
         handler.maxDist = PixelUtil.toPixelFromDIP(config.getDouble(KEY_MAX_DIST))
       }
       if (config.hasKey(KEY_NUMBER_OF_POINTERS)) {
-        handler.numberOfPointers = config.getInt(KEY_NUMBER_OF_POINTERS)
+        handler.numberOfPointersRequired = config.getInt(KEY_NUMBER_OF_POINTERS)
       }
     }