Removed not-used variable

Not sure about this, but just to catch the eye of the pro.
Git blame says 2012, so maybe it's really no more used

Change-Id: I737f3a1b2803f6ce98cb461350db18d06e0bf981
Reviewed-on: https://gerrit.libreoffice.org/62910Reviewed-by: László Németh <nemeth@numbertext.org>
Tested-by: László Németh <nemeth@numbertext.org>

librelogo/source/LibreLogo/LibreLogo.py

@@ -1836,7 +1836,6 @@ def __compil__(s):
     rmsp = re.compile(r"[ ]*([=+*/]|==|<=|>=|<>|!=|-[ ]+)[ ]*")
     chsp = re.compile(r"[ \t]+")
     chch = re.compile(r"(?u)(?<!\w):(?=\w)")
-    parenfix = re.compile(r"(?ui)(\([^\(\[\]\)]+)]\)")
 
     # remove CR characters and split lines
     s = re.sub(r'[ \t\r]*(?=\n)', '', s)