Fix a bug that would prevent spell checking

java.lang.ArrayIndexOutOfBoundsException:
        [I offset=0 length=528 src.length=512
com.android.inputmethod.keyboard.ProximityInfo
        .setProximityInfoNative(Native Method)
com.android.inputmethod.keyboard.ProximityInfo
        .createSpellCheckerProximityInfo(ProximityInfo.java:85)
com.android.inputmethod.latin.spellcheck.AndroidSpellCheckerService
        .createDictAndProximity(AndroidSpellCheckerService.java:411)

The array was too small with respect with the passed size.

Change-Id: I7777d7aecd17375d3fbf82854a66eb7a5a289ce6