Convert all remaining traces of hex code literals into references.

Author: bclothier

Rubberduck.Core/UI/CodeExplorer/CodeExplorerControl.xaml

@@ -213,7 +213,7 @@
                 <EventSetter Event="MouseRightButtonDown" Handler="TreeView_OnMouseRightButtonDown" />
                 <Style.Triggers>
                     <Trigger Property="IsSelected" Value="True">
-                        <Setter Property="BorderBrush" Value="#adc6e5"/>
+                        <Setter Property="BorderBrush" Value="{StaticResource HighlightBorderActiveBrush}"/>
                     </Trigger>
                     <MultiTrigger>
                         <MultiTrigger.Conditions>

Rubberduck.Core/UI/CodeMetrics/CodeMetricsControl.xaml

@@ -55,7 +55,7 @@
                             <Setter Property="HorizontalAlignment" Value="Left" />
                             <Style.Triggers>
                                 <Trigger Property="IsSelected" Value="True">
-                                    <Setter Property="BorderBrush" Value="#adc6e5"/>
+                                    <Setter Property="BorderBrush" Value="{StaticResource HighlightBorderActiveBrush}"/>
                                 </Trigger>
                                 <MultiTrigger>
                                     <MultiTrigger.Conditions>