Revert comma to original implementation

When #42 was merged the original solution become more optimal.

So reverting back to it.

jsfuck.js

@@ -88,7 +88,7 @@
     ')':   '([0]+false+[]["flat"])[20]',
     '*':   null,
     '+':   '(+(+!+[]+(!+[]+[])[!+[]+!+[]+!+[]]+[+!+[]]+[+[]]+[+[]])+[])[2]',
-    ',':   '([]["slice"]["call"](false+"")+"")[1]',
+    ',':   '[[]]["concat"]([[]])+""',
     '-':   '(+(.+[0000001])+"")[2]',
     '.':   '(+(+!+[]+[+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+[!+[]+!+[]]+[+[]])+[])[+!+[]]',
     '/':   '(false+[0])["italics"]()[10]',

output.txt

@@ -10,7 +10,7 @@
 `)` 97
 `*` 3567
 `+` 70
-`,` 359
+`,` 333
 `-` 135
 `.` 72
 `/` 249