JNI: use correct descriptor for getTable methid
JNI: use correct descriptor for getTable methid

bug: https://bugzilla.gnome.org/show_bug.cgi?id=752171

GNOME/java-atk-wrapper,thisMagpie/java-atk-wrapper,thisMagpie/java-atk-wrapper,GNOME/java-atk-wrapper,GNOME/java-atk-wrapper,thisMagpie/java-atk-wrapper