fix(ios): set "localizedFallbackTitle" to nil

this key is used for "a fallback button when biometric authentication fails". It doesn't make any
sense to set this to the "title" provided by the user

Author: LonelyCpp

ios/SimpleBiometrics.mm

@@ -36,7 +36,7 @@ @implementation SimpleBiometrics
         NSString *promptMessage = subtitle;
 
         LAContext *context = [[LAContext alloc] init];
-        context.localizedFallbackTitle = title;
+        context.localizedFallbackTitle = nil;
 
         LAPolicy localAuthPolicy = LAPolicyDeviceOwnerAuthenticationWithBiometrics;
         if (![[UIDevice currentDevice].systemVersion hasPrefix:@"8."]) {