Set Android InputType directly for the pin lock screen to force numeric-only keyboard layout. (#451)

* Set Android InputType directly for the pin lock screen to force numeric-only keyboard layout.

* Renamed variable

src/App/Controls/ExtendedEntry.cs

@@ -12,7 +12,7 @@ namespace Bit.App.Controls
             {
                 PlaceholderColor = Color.FromHex("c7c7cd");
             }
-
+            
             IsPasswordFromToggled = IsPassword;
         }
 
@@ -57,6 +57,7 @@ namespace Bit.App.Controls
         public bool DisableAutocapitalize { get; set; }
         public bool AllowClear { get; set; }
         public bool HideCursor { get; set; }
+        public bool NumbersOnly { get; set; }
 
         // Need to overwrite default handler because we cant Invoke otherwise
         public new event EventHandler Completed;

src/App/Controls/PinControl.cs

@@ -21,7 +21,8 @@ namespace Bit.App.Controls
             {
                 Keyboard = Keyboard.Numeric,
                 TargetMaxLength = 4,
-                HideCursor = true
+                HideCursor = true,
+                NumbersOnly = true
             };
 
             Entry.BackgroundColor = Entry.TextColor = Color.Transparent;