Do not append to `sys.path`

This is no longer needed since commit d16d3f1c.

Inst_eddies/Analysis/anim_eddy_contours.py

@@ -72,7 +72,6 @@ if __name__ == "__main__":
     import cartopy.crs as ccrs
     import pygifsicle
     from os import path
-    sys.path.append(path.join(sys.path[0], "../../Common"))
     import util_eddies
 
     # Process arguments: