android: release local ref to string after callback exec. in JNI
android: release local ref to string after callback exec. in JNI

Change-Id: I2a92a2beff214894ba63b3881a686337639a0b07

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core