Change folder icon to a folder

Author: donokuda

src/GitHub.VisualStudio/UI/Views/PullRequestDetailView.xaml

@@ -424,8 +424,7 @@
                                     <HierarchicalDataTemplate DataType="{x:Type vm:PullRequestDirectoryViewModel}"
                                                           ItemsSource="{Binding Children}">
                                         <StackPanel Orientation="Horizontal">
-                                            <!-- TODO: Use the right icon here -->
-                                            <ui:OcticonImage Icon="briefcase" Foreground="{DynamicResource GitHubVsWindowText}"/>
+                                            <ui:OcticonImage Icon="file_directory" Foreground="{DynamicResource GitHubVsWindowText}"/>
                                             <TextBlock Text="{Binding DirectoryName}" Margin="4 2" VerticalAlignment="Center"/>
                                         </StackPanel>
                                     </HierarchicalDataTemplate>