Use resource for pending review b/g.

Author: grokys

src/GitHub.VisualStudio.UI/Styles/ThemeBlue.xaml

@@ -63,5 +63,6 @@
   <SolidColorBrush x:Key="GitHubDiffGlyphFill.None" Color="#9EC7FF" />
 
   <SolidColorBrush x:Key="GitHubPeekViewBackground" Color="#F5F5F5" />
+  <SolidColorBrush x:Key="GitHubPendingReviewBackground" Color="#FFF8C7" />
   <SolidColorBrush x:Key="GitHubMultilineListItemActiveBrush" Color="#FFCCCEDB"/>
 </ResourceDictionary>

src/GitHub.VisualStudio.UI/Styles/ThemeDark.xaml

@@ -63,5 +63,6 @@
   <SolidColorBrush x:Key="GitHubDiffGlyphFill.None" Color="#569CD6" />
 
   <SolidColorBrush x:Key="GitHubPeekViewBackground" Color="#252526" />
+  <SolidColorBrush x:Key="GitHubPendingReviewBackground" Color="#FFF8C7" />
   <SolidColorBrush x:Key="GitHubMultilineListItemActiveBrush" Color="#FF3F3F46"/>
 </ResourceDictionary>

src/GitHub.VisualStudio.UI/Styles/ThemeLight.xaml

@@ -63,5 +63,6 @@
   <SolidColorBrush x:Key="GitHubDiffGlyphFill.None" Color="#9EC7FF" />
 
   <SolidColorBrush x:Key="GitHubPeekViewBackground" Color="#F5F5F5" />
+  <SolidColorBrush x:Key="GitHubPendingReviewBackground" Color="#FFF8C7" />
   <SolidColorBrush x:Key="GitHubMultilineListItemActiveBrush" Color="#FFCCCEDB"/>
 </ResourceDictionary>

src/GitHub.VisualStudio/Views/GitHubPane/PullRequestReviewSummaryView.xaml

@@ -39,7 +39,7 @@
                     <Setter Property="Padding" Value="0 5"/>
                     <Style.Triggers>
                         <DataTrigger Binding="{Binding State}" Value="Pending">
-                            <Setter Property="Background" Value="#FFF8C7"/>
+                            <Setter Property="Background" Value="{DynamicResource GitHubPendingReviewBackground}"/>
                             <Setter Property="Padding" Value="6 2 6 4"/>
                         </DataTrigger>
                     </Style.Triggers>