Just click on the track (not the clip) and then click on the little “funnel” that respresents the filters applied t the track. This will bring up the Filters panel. If you have several filters tick/untick them in turn until you find the one you want to delete. Then just press the “-” button at the bottom of the filters panel. See the pink circles in the image below (you may have to expand it to full-screen to see the whole image - i.e. click on it):
