Fixed erroneous namespace on LineView to match other views

Fixes  #1653

Terminal.Gui/Views/LineView.cs

@@ -1,7 +1,7 @@
 using System;
 using Terminal.Gui.Graphs;
 
-namespace Terminal.Gui.Views {
+namespace Terminal.Gui {
 	
 	/// <summary>
 	/// A straight line control either horizontal or vertical

UICatalog/Scenarios/LineViewExample.cs

@@ -4,7 +4,6 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using Terminal.Gui;
-using Terminal.Gui.Views;
 using static UICatalog.Scenario;
 
 namespace UICatalog.Scenarios {