lib/spark.py: Remove unnecessary assignment to color_codes

Since color_codes is immediately redefined directly below this, the
former of the two assignemnts is unnecessary.

Signed-off-by: Kristofer Rye <kristofer.rye@gmail.com>

lib/spark.py

@@ -301,19 +301,6 @@ def draw_wind(data, color_data):
 
     def _color_code_for_wind_speed(wind_speed):
 
-        color_codes = [
-            (3, 82),    # 82
-            (6, 118),   # 118
-            (9, 154),   # 154
-            (12, 250),  # 190
-            (15, 246),  # 226
-            (19, 253),  # 220
-            (23, 214),
-            (27, 208),
-            (31, 202),
-            (-1, 196)
-        ]
-
         color_codes = [
             (3,  241),  # 82
             (6,  242),  # 118