Not including a leading slash in Administrator Path causes navigation issues

Version: Admin Panel v1.10.38

If a user leaves out a leading slash in the Administrator Path setting, this can allow the navigation to start to act up as the link generation seems to assume that it should use a relative directory path based on the current URL

Example:

If a user goes to modify the admin panel plugin's settings from the web ui:
User clicks on Plugins and gets the list of plugins, the url is [sitename]/[adminpath]/plugins
User clicks on Admin Panel plugin in the list, url becomes [sitename]/[adminpath]/[adminpath]/plugins/admin

If user then clicks on Plugins in the side nav again to try to return to the list, url becomes [sitename]/[adminpath]/[adminpath]/plugins/[adminpath]/plugins

Recommendations:
- Modify url generation to base path based on grav root instead of current url
OR
- Modify admin panel to have sanity check to prompt user to have leading forward slash in box