As discussed with team, now logout will not clear latest and first install referrers.

Author: NidhiDixit09

BranchSDK/Branch.m

@@ -1077,7 +1077,6 @@ - (void)logoutWithCallback:(callbackWithStatus)callback {
 
     // Removed stored values
     self.preferenceHelper.userIdentity = nil;
-    self.preferenceHelper.sessionParams = nil;
 
     if (callback) {
         callback(YES, nil);