Update ListedItem.cs

Author: yaira2

src/Files.App/Data/Items/ListedItem.cs

@@ -365,11 +365,17 @@ public string DimensionsDisplay
 			}
 		}
 
-		// This is used to avoid passing a null value to AutomationProperties.Name, which causes a crash
+		/// <summary>
+		/// Contextual property that changes based on the item type
+		/// </summary>
 		public string ContextualPropertyString => FileExtension switch
 		{
-			_ when FileExtensionHelpers.IsImageFile(FileExtension) => string.IsNullOrEmpty(DimensionsDisplay) ? string.Empty : string.Join(": ", Strings.PropertyDimensions.GetLocalizedResource(), DimensionsDisplay),
-			_ => string.IsNullOrEmpty(ItemDateModified) ? string.Empty : string.Join(": ", Strings.Modified.GetLocalizedResource(), ItemDateModified)
+			_ when FileExtensionHelpers.IsImageFile(FileExtension) => !string.IsNullOrEmpty(DimensionsDisplay)
+				? $"{Strings.PropertyDimensions.GetLocalizedResource()}: {DimensionsDisplay}"
+				: string.Empty,
+			_ => !string.IsNullOrEmpty(ItemDateModified)
+				? $"{Strings.Modified.GetLocalizedResource()}: {ItemDateModified}"
+				: string.Empty
 		};
 
 		/// <summary>