Revert "Disable a broken styling, we shouldn't need this but the app is crashing without it"

This reverts commit 8a494ec.

Author: halgari

src/Themes/NexusMods.Themes.NexusFluentDark/Styles/UserControls/MessageBox/MessageBoxStyles.axaml

@@ -30,6 +30,10 @@
         <Style Selector="^ TextBlock#MessageTextBlock">
             <Setter Property="Theme" Value="{StaticResource BodyMDNormalTheme}" />
         </Style>
+        
+        <Style Selector="^ TextBlock#MessageTextBlockBold">
+            <Setter Property="Theme" Value="{StaticResource BodyMDBoldTheme}" />
+        </Style>
     </Style>
 
 </Styles>