[cmdpal][AOT] fix some cmdpal aot issue (#40301)

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## Summary of the Pull Request

<del>Most of them are safe change but only one line may break something
is in
[TrayIconService.cs](https://github.com/microsoft/PowerToys/compare/yuleng/aot/pr?expand=1#diff-bc3e603a50df89710c69ff6f4fc8f29967fca19cdbe615f06b53534e9c986bb5)</del>
ok, I've confirmed no problem.


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Co-authored-by: Yu Leng (from Dev Box) <yuleng@microsoft.com>

src/modules/cmdpal/Microsoft.CmdPal.UI/Helpers/TrayIconService.cs

@@ -72,7 +72,7 @@ internal sealed partial class TrayIconService
                 _largeIcon = GetAppIconHandle();
                 _trayIconData = new NOTIFYICONDATAW()
                 {
-                    cbSize = (uint)Marshal.SizeOf(typeof(NOTIFYICONDATAW)),
+                    cbSize = (uint)Marshal.SizeOf<NOTIFYICONDATAW>(),
                     hWnd = _hwnd,
                     uID = MY_NOTIFY_ID,
                     uFlags = NOTIFY_ICON_DATA_FLAGS.NIF_MESSAGE | NOTIFY_ICON_DATA_FLAGS.NIF_ICON | NOTIFY_ICON_DATA_FLAGS.NIF_TIP,
@@ -133,7 +133,7 @@ internal sealed partial class TrayIconService
 
     private DestroyIconSafeHandle GetAppIconHandle()
     {
-        var exePath = System.Reflection.Assembly.GetExecutingAssembly().Location;
+        var exePath = Path.Combine(AppContext.BaseDirectory, "Microsoft.CmdPal.UI.exe");
         DestroyIconSafeHandle largeIcon;
         PInvoke.ExtractIconEx(exePath, 0, out largeIcon, out _, 1);
         return largeIcon;