Remove bogus execute permission and shebang line from sudoku example (#1008)

* Remove spurious shebang line from sudoku example

The shebang line was not on the first line of the file, so it had no
effect. No other examples attempt to be executable via shebang lines.

* Remove unnecessary execute permissions from sudoku example

Author: musicinmybrain

examples/finished/sudoku.py

@@ -1,8 +1,6 @@
 ##@file sudoku.py
 # @brief Simple example of modeling a Sudoku as a binary program
 
-# !/usr/bin/env python
-
 from pyscipopt import Model, quicksum
 
 # initial Sudoku values