Fix formatting, return tooltip to be private in FileDialog

(cherry picked from commit 21b1106)

Author: zorana-curkovic

mcs/class/System.Windows.Forms/System.Windows.Forms/FileDialog.cs

@@ -2239,7 +2239,7 @@ internal class MWFFileView : ListView
 
 		private int filterIndex = 1;
 
-		public ToolTip toolTip;
+		private ToolTip toolTip;
 		private int oldItemIndexForToolTip = -1;
 
 		private ContextMenu contextMenu;

mcs/class/System.Windows.Forms/System.Windows.Forms/ListView.cs

@@ -287,6 +287,7 @@ public ListView ()
 
 			v_scroll = new ImplicitVScrollBar ();
 			Controls.AddImplicit (this.v_scroll);
+
 			h_marker = v_marker = 0;
 			keysearch_tickcnt = 0;
 

mcs/class/System.Windows.Forms/System.Windows.Forms/TreeView.cs

@@ -2232,8 +2232,8 @@ private void MouseLeftItem (TreeNode item)
 		private ToolTip ToolTipWindow {
 			get {
 				if (tooltip_window == null)
-					tooltip_window = new ToolTip(this);
-				
+					tooltip_window = new ToolTip (this);
+
 				return tooltip_window;
 			}
 		}