There is a cheat that will allow you to move or delete objects that are in use. It's called move objects on, sometimes abbreviated as MOO.
To use the cheat console, press control-shift-C, and it will appear at the top of your screen.
Type "testingcheatsenabled true" without the quotation and marks, and press enter.
Then press control-shift-C again to open the cheat console again, and type: "moveobjects on", without the quotation marks. Then you should be able to delete the bar.
When you've finished, you can go back to normal gameplay by opening the cheat console (control-shift-c) one last time, and type "testingcheatsenabled false".
Good luck.