Re-attempt display of queued IAMs when unpausing

Setting InAppMessages.Paused = false re-evaluated triggers but never
drained messages already queued while paused, so they stayed parked in
messageDisplayQueue until the next session boundary. The unpause branch
of the paused setter now also calls attemptToShowInAppMessage() to drain
the existing queue before re-evaluating triggers.

Fixes #2647

Author: claude

OneSignalSDK/onesignal/in-app-messages/src/main/java/com/onesignal/inAppMessages/internal/InAppMessagesManager.kt

@@ -189,6 +189,9 @@ internal class InAppMessagesManager(
 
             if (!value) {
                 suspendifyOnDefault {
+                    // Drain any messages that were queued but blocked from displaying while paused,
+                    // then re-evaluate triggers in case new messages now qualify.
+                    attemptToShowInAppMessage()
                     evaluateInAppMessages()
                 }
             }