fix: prevent audio source reset in disabled mode

[SystemChanger]

Suneditor in disabled (read-only) mode.

Before:

After:

P.S. @JiHong88 Another solution was to add e.stopPropagation() to audio element onInput(e) on its creation, but I thought that in the future this problem may affect other plugins, or we may need to handle some events in onInput_wysiwyg, so I decided to place handler in onInput_wysiwyg. You may reconsider it ;)
P.P.S. Cool 'editMode' button I have, don't you think so? ;)

[JiHong88]

@SystemChanger Sorry, for the late reply.
First of all thanks for your contribution.
I checked too late.
This is a really useful.
Can you please re request PR at current master version?
All PR are conflicting with the master version.