the SDK state clear happened with the old close call, move it to clear on background to match previous behavior

Author: echo-branch

BranchSDK/Branch.m

@@ -1738,6 +1738,7 @@ - (void)applicationDidBecomeActive {
 
 - (void)applicationWillResignActive {
     if (!Branch.trackingDisabled) {
+        self.initializationStatus = BNCInitStatusUninitialized;
         [self.requestQueue persistImmediately];
         [BranchOpenRequest setWaitNeededForOpenResponseLock];
         BNCLogDebugSDK(@"Application resigned active.");