Update walker_class.py

./kyu_3/line_safari_is_that_a_line/walker_class.py:222:5: E303 too many blank lines (2)
    def __test_down(self) -> bool:
    ^
./kyu_3/line_safari_is_that_a_line/walker_class.py:228:5: E303 too many blank lines (2)
    def __test_left(self) -> bool:
    ^
./kyu_3/line_safari_is_that_a_line/walker_class.py:234:5: E303 too many blank lines (2)
    def __test_right(self) -> bool:
    ^

kyu_3/line_safari_is_that_a_line/walker_class.py

@@ -218,19 +218,16 @@ def __test_up(self) -> bool:
         col: int = self.__position['col']
         return row >= 1 and self.__grid[row - 1][col] in 'X|+'
 
-
     def __test_down(self) -> bool:
         row: int = self.__position['row']
         col: int = self.__position['col']
         return row + 1 < len(self.__grid) and self.__grid[row + 1][col] in 'X|+'
 
-
     def __test_left(self) -> bool:
         row: int = self.__position['row']
         col: int = self.__position['col']
         return col >= 1 and self.__grid[row][col - 1] in 'X+-'
 
-
     def __test_right(self) -> bool:
         row: int = self.__position['row']
         col: int = self.__position['col']