Fix string pointer for appUpdateURL
Fix string pointer for appUpdateURL

syoung-smallwisdom/ResearchUXFactory-iOS,Sage-Bionetworks/BridgeAppSDK,Sage-Bionetworks/BridgeAppSDK,syoung-smallwisdom/ResearchUXFactory-iOS,Sage-Bionetworks/BridgeAppSDK,Sage-Bionetworks/BridgeAppSDK,syoung-smallwisdom/ResearchUXFactory-iOS,Sage-Bionetworks/BridgeAppSDK,syoung-smallwisdom/ResearchUXFactory-iOS