fixed setting the font size via css syntax - Closes Bug #55006
The pspp 1.2.0 release showed a problem with setting the font via
the font selection dialog. The root cause is that the style
setting should be done via css syntax and not pango syntax. I
changed the code to do the style setting via css syntax.
See: https://savannah.gnu.org/bugs/?55006
The minimum width setting in the comment dialog does not work how
it is implemented. I removed that code part as it does not seem
to be crucial. At least on MacOS the default
width is large enough to hold 80 characters. Even without that
the user can increase the size of the dialog.