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
2. Run the app, align both toolbars to the left one under another.
3. Stop the app.
4. Open the user.config file, located somethere at C:\Users\<user>\AppData\Local\ToolstripLoad\ToolstripLoad_Url_<random string>\1.0.0.0, check that both toolbars' locations are like this:

        <System.Windows.Forms.ToolStripSettings.toolsettings.ToolStripFilters>
            <setting name="Name" serializeAs="String">
                <value>ToolStripFilters</value>
            </setting>
            <setting name="Location" serializeAs="String">
                <value>7, 25</value>
            </setting>
        </System.Windows.Forms.ToolStripSettings.toolsettings.ToolStripFilters>
        <System.Windows.Forms.ToolStripSettings.toolsettings.ToolStripMain>
            <setting name="Name" serializeAs="String">
                <value>ToolStripMain</value>
            </setting>
            <setting name="Location" serializeAs="String">
                <value>7, 0</value>
            </setting>
        </System.Windows.Forms.ToolStripSettings.toolsettings.ToolStripMain>

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.