WINGs: Enable cursor blinking in text fields
This code was commented out but enabling it leads to no issues AFAICS
and improves the usability of WINGs applications.
The motivation for this patch comes from the need of distinguishing
where the cursor is in the WINGs-based application which handles the
database of my comics collection.
This changes the behavior in all parts of wmaker where there is
a text field entry, e.g. in the settings panel of dockapps. There should
be no issues with a blinking cursor in such cases though...