[BUG] Update button in viewer mode in generic SM plugin throwing 405 on click

[aaronzi]

Describe the bug
When clicking on the ⬆️ button when in the generic SM plugin in the AAS Viewer mode, a webrequest is send that return a 405. This is caused by a faulty path generation for the request.

Since the feature for patching SMEs wasn't even planned in the viewer mode, this functionality should be disabled.

To Reproduce
Steps to reproduce the behavior:

1. Go in the AAS Viewer mode from the main menu
2. Click on a Submodel that has not it's own dedicated plugin
3. Navigate to a property and click on ⬆️
4. See error 405

Expected behavior
There should be no button to update the value of an element.

BaSyx (please complete the following information):

• BaSyx: Version v2.0
• BaSyx SDK: Java
• AAS Version: DotAAS V3

Desktop (please complete the following information):

• OS: Windows
• Browser: Chrome
• Version: 23