decfszInstruction (#12)

Co-authored-by: Darkress <30271678+DarkressX@users.noreply.github.com>
Reviewed-on: darkress/pic16f84-sim#12

de/darkress/pic16f84sim/decoder/CommandDecoder.java

@@ -17,8 +17,7 @@ public class CommandDecoder
             case 0x300:
                 return new Decf(input);
             case 0xB00:
-                //decfsz();
-                break;
+                return new Decfsz(input);
             case 0xA00:
                 //incf();
                 break;