CmdPal: Fix paths to dirs on the Run fallback (#40850)

We were being too clever with `\`; and yet simultaneously not clever
enough.
* When we saw `c:\users`, we'd treat that as a path with a Title
`users\`
* but when we saw `c:\users\`, we'd fail to find a file name, and the
just treat the name as `\`. That was dumb.
* And we'd add trailing `\`'s even if there already was one.
* But then if the user typed `c:\users`, we would immediately start
enumerating children of that dir, which didn't really feel right

This PR fixes all of that.

Closes #40797

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Shell/FallbackExecuteItem.cs

@@ -154,11 +154,11 @@ internal sealed partial class FallbackExecuteItem : FallbackCommandItem, IDispos
         else if (pathIsDir)
         {
             var pathItem = new PathListItem(exe, query, _addToHistory);
+            Command = pathItem.Command;
+            MoreCommands = pathItem.MoreCommands;
             Title = pathItem.Title;
             Subtitle = pathItem.Subtitle;
             Icon = pathItem.Icon;
-            Command = pathItem.Command;
-            MoreCommands = pathItem.MoreCommands;
         }
         else if (System.Uri.TryCreate(searchText, UriKind.Absolute, out var uri))
         {