Remove unused converters

Their declaration in XAML in made redundant by the ResourecDictionary.

Author: IvenBach

Rubberduck.Core/UI/Refactorings/ExtractInterface/ExtractInterfaceView.xaml

@@ -1,10 +1,9 @@
 <UserControl x:Class="Rubberduck.UI.Refactorings.ExtractInterfaceView"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
-             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
-             xmlns:converters="clr-namespace:Rubberduck.UI.Converters"
-             mc:Ignorable="d" 
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             mc:Ignorable="d"
              d:DesignHeight="300" d:DesignWidth="300">
     <UserControl.Resources>
         <ResourceDictionary>
@@ -13,8 +12,6 @@
             </ResourceDictionary.MergedDictionaries>
 
             <BitmapImage x:Key="InvalidInterfaceImage" UriSource="pack://application:,,,/Rubberduck.Resources;component/Icons/Fugue/cross-circle.png" />
-            <converters:BoolToVisibleVisibilityConverter x:Key="BoolToVisibility" />
-            <converters:BoolToHiddenVisibilityConverter x:Key="BoolToHiddenVisibility" />
         </ResourceDictionary>
     </UserControl.Resources>
     <Grid>