Show hermes flag

Author: MoOx

template/src/App.re

@@ -86,12 +86,14 @@ let app = () =>
     <SafeAreaView>
       <ScrollView
         contentInsetAdjustmentBehavior=`automatic style={styles##scrollView}>
+        {Global.hermesInternal->Belt.Option.isNone
+           ? React.null
+           : <View style=styles##engine>
+               <Text style=styles##footer>
+                 "Engine: Hermes"->React.string
+               </Text>
+             </View>}
         <Header />
-        //  {global.HermesInternal == null ? null : (
-        //    <View style={styles##engine}>
-        //      <Text style={styles##footer}>Engine: Hermes</Text>
-        //    </View>
-        //  )}
         <View style={styles##body}>
           <View style={styles##sectionContainer}>
             <Text style={styles##sectionTitle}>