change spacing on math

wordle

@@ -422,7 +422,7 @@ function update_stats() {
   declare num=0
   declare den=0
   for (( i=0; i<${#GAME_HIST[@]}; i++)); do
-    ((den += ${GAME_HIST[$i]}))
+    (( den += ${GAME_HIST[$i]} ))
     (( num += ${GAME_HIST[$i]}*(i+1) ))
 
   done