Remove   inserted by TinyMCE

[jace]

When editing text in TinyMCE, it will occasionally insert a   instead of space (for instance if the user pressed space twice—causing an   to be inserted for the second space—and then deleted the space space). Since an   is legitimate when multiple spaces are indeed required, which we do not seek to judge here, we only look for an   flanked by non-whitespace on both sides and remove those.

s/(\S) (\S)/\1 \2/ig

This applies to the TinyMce3Field and TinyMce4Field widgets.