moving setClass for NSKeyedUnarchiver outside of version check

This means that the NSKeyedUnarchiver class for OSInAppMessage will always be OSInAppMessageInternal even if the migration doesn't run. This is safe because OSInAppMessage does not conform to codeable so it should never be archived/unarchived.

Author: emawby

iOS_SDK/OneSignalSDK/Source/OSMigrationController.m

@@ -118,6 +118,7 @@ - (void)migrateIAMRedisplayCache {
 - (void)migrateToOSInAppMessageInternal {
     let nameChangeVersion = 30700;
     long sdkVersion = [OneSignalUserDefaults.initShared getSavedIntegerForKey:OSUD_CACHED_SDK_VERSION defaultValue:0];
+    [NSKeyedUnarchiver setClass:[OSInAppMessageInternal class] forClassName:@"OSInAppMessage"];
     if (sdkVersion < nameChangeVersion) {
         [OneSignal onesignal_Log:ONE_S_LL_DEBUG message:[NSString stringWithFormat:@"Migrating OSInAppMessage from version: %ld", sdkVersion]];