games/oneko: unbreak install if locale-specific app-defaults dir exists

configure tries to autodetect existing japanese app-defaults and if
finds installs there without updating pkg-plist. A quick search turns
up the following ports can cause the issue if installed beforehand.

deskutils/xcalendar/pkg-plist:lib/X11/ja_JP.eucJP/app-defaults/XCalendar
games/xshisen/pkg-plist:lib/X11/ja_JP.eucJP/app-defaults/XShisen
japanese/tgif/pkg-plist:lib/X11/ja_JP.eucJP/app-defaults/Tgif.sample
x11-clocks/emiclock/pkg-plist:lib/X11/ja_JP.EUC/app-defaults/EmiClock
x11-clocks/emiclock/pkg-plist:lib/X11/ja_JP.eucJP/app-defaults/EmiClock
x11-fonts/nexfontsel/pkg-plist:lib/X11/ja_JP.eucJP/app-defaults/NeXFontSel
x11/xmascot/pkg-plist:lib/X11/ja_JP.EUC/app-defaults/XMascot
x11/xmascot/pkg-plist:lib/X11/ja_JP.eucJP/app-defaults/XMascot

PR: 199493
Submitted by: turutani@scphys.kyoto-u.ac.jp
Approved by: maintainer timeout (2 weeks + 4 days)