Correctly use backslashes for indent-chars

* zig-mode.el: ']', ')' and '}' require backslash, while for the ',' it is
recommended.

Author: theothornhill

zig-mode.el

@@ -226,8 +226,7 @@ If given a SOURCE, execute the CMD on it."
     "null" "undefined"))
 
 (defconst zig-electric-indent-chars
-  '(?\; ?, ?\) ?\] ?}))
-
+  '( ?\; ?\, ?\) ?\] ?\} ))
 
 (defface zig-multiline-string-face
   '((t :inherit font-lock-string-face))