android: hold wakelock for 30 seconds after received event was processed, to prevent race condition with incoming call activity. (#6224)

* android: hold wakelock for 45 seconds after event is received

* create new lock instances, delay release by 30 seconds

* comment

apps/multiplatform/common/src/androidMain/kotlin/chat/simplex/common/platform/SimplexService.android.kt

@@ -12,8 +12,11 @@ actual fun getWakeLock(timeout: Long): (() -> Unit) {
     }
   }
   return {
-    wakeLock?.release()
-    wakeLock = null
+    val lock = wakeLock
+    if (lock != null) {
+      if (lock.isHeld) lock.release()
+      wakeLock = null
+    }
   }
 }