[local_auth] Fix incorrect switch fallthrough

packages/local_auth/android/src/main/java/io/flutter/plugins/localauth/AuthenticationHelper.java

@@ -138,6 +138,7 @@ public void onAuthenticationError(int errorCode, CharSequence errString) {
           return;
         }
         completionHandler.onError("NotAvailable", "Security credentials not available.");
+        break;
       case BiometricPrompt.ERROR_NO_SPACE:
       case BiometricPrompt.ERROR_NO_BIOMETRICS:
         if (promptInfo.isDeviceCredentialAllowed()) return;