We need to use half width "A" for ui-direct.png

[utuhiro78]

Thank you for fixing #12. I found fcitx5-mozc used full width "A" for ui-direct.png. We need to use half width "A" for it.

Mode	Fcitx5-mozc	Mozc	OK/NG
Direct	full width "A"	half width "A"	NG
Half ASCII	_ + half width "A"	_ + half width "A"	OK
Full ASCII	full width "A"	full width "A"	OK

[utuhiro78]

Thanks!