Update FSDMsg.java
Update FSDMsg.java

Use Character.isDefined to handle Unicode chars instead of just the ascii range.

tested with ```xml<field id="prod-description" type="A" separator="00B6" length="50" />```
bharavi/jPOS,jpos/jPOS,yinheli/jPOS,alcarraz/jPOS,barspi/jPOS,sebastianpacheco/jPOS,juanibdn/jPOS,atancasis/jPOS,yinheli/jPOS,barspi/jPOS,c0deh4xor/jPOS,sebastianpacheco/jPOS,atancasis/jPOS,jpos/jPOS,poynt/jPOS,barspi/jPOS,jpos/jPOS,bharavi/jPOS,juanibdn/jPOS,c0deh4xor/jPOS,imam-san/jPOS-1,sebastianpacheco/jPOS,juanibdn/jPOS,bharavi/jPOS,poynt/jPOS,fayezasar/jPOS,imam-san/jPOS-1,alcarraz/jPOS,yinheli/jPOS,atancasis/jPOS,c0deh4xor/jPOS,alcarraz/jPOS,fayezasar/jPOS,imam-san/jPOS-1,poynt/jPOS