HaikuWebkit 1.4.7.
CharacterMap: show font family and style

Signed-off-by: Adrien Destugues <pulkomandy@gmail.com>

Fixes #3651 item 2.
CharacterMap: avoid jumping window size

set explicit minimum width of character view to be a bit larger than
fCodeView so that there isn't jumping of the pane sizes when fCodeView's
contents are too long

Signed-off-by: Adrien Destugues <pulkomandy@gmail.com>

Fixes #3651 part 9.