Select 2nd instead of 3rd cell on MarkAllUpdatesToolButton_Click

[DasSkelett]

Problem

After the MarkAllUpdatesToolButton is clicked, the modlist scrolls to the top by selecting the third (index 2) cell of the first row.
With v1.26, this column is no longer the mod name, but the replace checkbox.
If this one is hidden, CKAN throws an error (because you cant select hidden cells, and it is in most cases):

System.InvalidOperationException: Die aktuelle Zelle kann nicht auf eine unsichtbare Zelle festgelegt werden.
   bei System.Windows.Forms.DataGridView.set_CurrentCell(DataGridViewCell value)
   bei CKAN.Main.MarkAllUpdatesToolButton_Click(Object sender, EventArgs e)
   bei System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
   bei System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e)
   bei System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
   bei System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
   bei System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
   bei System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   bei System.Windows.Forms.Control.WndProc(Message& m)
   bei System.Windows.Forms.ToolStrip.WndProc(Message& m)
   bei System.Windows.Forms.MenuStrip.WndProc(Message& m)
   bei System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Solution

Now the second cell instead of the third cell is selected, which is shown if there are updates available (otherwise you can't even click the button to mark all updatable mods), and which can't be hidden by the user, so the same error can't repeat with other columns.

Fixes #2703