fix: restore drop zone click - add Transparent background to inner Grid, remove IsHitTestVisible from Rectangle

EbayListingTool/Views/NewListingView.xaml

@@ -1,4 +1,4 @@
-<UserControl x:Class="EbayListingTool.Views.NewListingView"
+<UserControl x:Class="EbayListingTool.Views.NewListingView"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:mah="http://metro.mahapps.com/winfx/xaml/controls"
@@ -98,14 +98,14 @@
                         Cursor="Hand"
                         MinHeight="180"
                         AutomationProperties.Name="Photo drop zone - drop photos here or click to browse">
-                    <Grid>
+                    <Grid Background="Transparent">
                         <!-- Dashed border via Rectangle -->
                         <Rectangle x:Name="DropBorderRect"
                                    StrokeThickness="2"
                                    StrokeDashArray="6,4"
                                    RadiusX="10" RadiusY="10"
                                    Stroke="{DynamicResource MahApps.Brushes.Gray6}"
-                                   IsHitTestVisible="False"/>
+                                   />
                         <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center"
                                     Margin="0,40"
                                     IsHitTestVisible="False">