Incorrect toolbar location when restored via `ToolStripManager.LoadSettings`

Presumably all versions:
* .NET Framework: 4.6.1 (tested)
* .NET Version: 5.0 (tested)

**Problem description:**

Originally reported in https://github.com/gitextensions/gitextensions/issues/8680.

If an application has multiple toolbars, and those are placed at an arbitrary location and persisted via `ToolStripManager.SaveSettings`, not all toolbars will be correctly located once `ToolStripManager.LoadSettings` is called.
E.g. on save:

On load:

**Expected behavior:**

The location of the toolbars persisted in the config must be preserved.

**Minimal repro:**

1. clone https://github.com/RussKie/Test-ToolStripLoad
1. Run the app, align both toolbars to the left one under another.
2. Stop the app.
3. Open the user.config file, located somethere at `C:\Users\\AppData\Local\ToolstripLoad\ToolstripLoad_Url_\1.0.0.0`, check that both toolbars' locations are like this:
```xml


ToolStripFilters


7, 25




ToolStripMain


7, 0


```
4. Run the app again and observe the bottom toolbar shifted by few pixels to the right.
5. Close the app and see that the location value for `ToolStripFilters` has changed.