[PS-1009] Changed keyboard on Passphrase generator to not allow emojis (#2038)

* PS-1009 Added effect to Entry that doesn't allow keyboard with emojis on passphrase separator

* PS-1009 Removed unnecessary ImeOptions setting from NoEmojiKeyboardEffect
Improved code

* PS-1009 Removed unnecessary null validation on Android's NoEmojiKeyboardEffect

Co-authored-by: Federico Maccaroni <fedemkr@gmail.com>

src/App/Effects/NoEmojiKeyboardEffect.cs

@@ -0,0 +1,12 @@
+using System;
+using Xamarin.Forms;
+
+namespace Bit.App.Effects
+{
+    public class NoEmojiKeyboardEffect : RoutingEffect
+    {
+        public NoEmojiKeyboardEffect()
+            : base("Bitwarden.NoEmojiKeyboardEffect")
+        { }
+    }
+}