No TeX styling on the black ones at all

.github/workflows/cost-differences/diff.py

@@ -43,7 +43,7 @@ def update_colour(x):
       return x
 
     if x > 0:
-      return f"$${{\\color{{black}}+{x}}}$$"
+      return f"+{x}"
     else:
       return f"$${{\\color{{green}}{x:.2f}}}$$"