fix: add react context getter to LdkEventEmitter

Author: jvsena42

lib/android/src/main/java/com/reactnativeldk/LdkModule.kt

@@ -1730,6 +1730,10 @@ object LdkEventEmitter {
         this.reactContext = reactContext
     }
 
+    fun getReactContext(): ReactContext? {
+        return this.reactContext
+    }
+    
     fun send(eventType: EventTypes, body: Any) {
         if (this.reactContext === null) {
             return

lib/android/src/main/java/com/reactnativeldk/classes/LdkPersister.kt

@@ -39,7 +39,7 @@ class LdkPersister {
                 file.writeBytes(serialized)
 
                 // Update chain monitor on main thread
-                LdkModule.reactContext?.runOnUiThread {
+                LdkModule.getReactContext()?.runOnUiThread {
                     val res = LdkModule.chainMonitor?.channel_monitor_updated(channelFundingOutpoint, data._latest_update_id)
                     if (res == null || !res.is_ok) {
                         LdkEventEmitter.send(EventTypes.native_log, "Failed to update chain monitor with persisted channel (${channelId})")
@@ -75,7 +75,7 @@ class LdkPersister {
                 }
 
                 //Update chain monitor with successful persist on main thread
-                LdkModule.reactContext?.runOnUiThread {
+                LdkModule.getReactContext()?.runOnUiThread {
                     val res = LdkModule.chainMonitor?.channel_monitor_updated(channelFundingOutpoint, data._latest_update_id)
                     if (res == null || !res.is_ok) {
                         LdkEventEmitter.send(EventTypes.native_log, "Failed to update chain monitor with persisted channel (${channelId})")