Fix Markings Menu (DeltaV-Station#997)

# Description

This PR adds a vertical scroll bar to the Markings tab, which fixes an
issue where markings with > 2 color selections could not be used.

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![image](https://github.com/user-attachments/assets/fe4ea61a-ced2-4d6d-bc8c-92e752a77d98)

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# Changelog

:cl:
- fix: Fixed the Markings menu by adding a scroll container to it.
Markings with greater than 2 color selections can now be used.

Content.Client/Preferences/UI/HumanoidProfileEditor.xaml

@@ -199,8 +199,10 @@
                 <ui:NeoTabContainer Name="CLoadoutsTabs" VerticalExpand="True" SeparatorMargin="0" />
             </BoxContainer>
             <BoxContainer Name="CMarkingsTab" HorizontalExpand="True" Orientation="Vertical" Margin="10">
-                <!-- Markings -->
-                <humanoid:MarkingPicker Name="CMarkings" IgnoreCategories="Hair,FacialHair" />
+                <ScrollContainer HorizontalExpand="True" HScrollEnabled="True" VerticalExpand="True" VScrollEnabled="True">
+                    <!-- Markings -->
+                    <humanoid:MarkingPicker Name="CMarkings" IgnoreCategories="Hair,FacialHair" />
+                </ScrollContainer>
             </BoxContainer>
         </ui:NeoTabContainer>
     </BoxContainer>