Update OBEX lib setPath Flags handling logic to be compatible with spec.

From IrOBEX, 3.3.6.1, we can see below explanation for Flags bit 1:
1  Don't create directory if it does not exist, return an error instead.
The correct understanding should be: if bit 1 is set to 1, we'll not create
directory if it not exist; if bit 1 is set to 0, we'll create it if it not
exists.

obex/javax/obex/ServerSession.java

@@ -315,7 +315,7 @@ public final class ServerSession extends ObexSession implements Runnable {
                 if (!((flags & 1) == 0)) {
                     backup = true;
                 }
-                if ((flags & 2) == 0) {
+                if (!((flags & 2) == 0)) {
                     create = false;
                 }