fix: Android LlamaDemo app - remove unnecessary stop code check per model#200

kirklandsign merged 2 commits intometa-pytorch:mainmeta-pytorch/executorch-examples:mainfrom

saiskandadotin:fix-android-llamademo-stop-token-handlingsaiskandadotin/executorch-examples:fix-android-llamademo-stop-token-handlingCopy head branch name to clipboard