Sidebar fix for more space for plugins or sub-links

[opnsenseuser]

if there is not enough space in a list of links upwards, the list moves down by the number of menu entries. so the problem with too many entries should now be solved.  I counted 34 possible plugins or sublinks, with a resolution of 1080 without scroll bars.

For more info go to my account-page:
https://twitter.com/opnsenseuser