StaticList default suggest editor with freetext doesn't allow to type a comma

It is not possible to type a comma (",") in free values of a static list: the comma is always use to type a new value, even if the class does not define it as a separator.

Reproduction step:
1. Create a new page with a class containing a unique StaticList property with the following parameters:

• Display type = Input
• Multiple Select is checked
• Use Suggest is checked
• Multiselect seperators = | (and only it)
• Free text = allowed
  2. Add a new object from the same page and try to type the following value: "A value, with a comma"

Expected result:

• The entire value "A value, with a comma" is recorded

Obtained result:

• 2 values are recorded: "A value" and "with a comma"

Notes: even if "|" is used as a separator, you can create any value containing a "|" it won't be used to separate values in the editor.

It has been tested on both Firefox and Chrome.