Logic changed and Readability improved

Changed the way the auto enrollment id selector code works, and changed "okid" to "usedid" so that the code is easier to understand.

Author: JoshHawley

FPS_GT511C3/Examples/FPS_Enroll/FPS_Enroll.ino

@@ -34,11 +34,11 @@ void Enroll()
 
 	// find open enroll id
 	int enrollid = 0;
-	bool okid = false;
-	while (okid == false)
+	bool usedid = true;
+	while (usedid == true)
 	{
-		okid = fps.CheckEnrolled(enrollid);
-		if (okid==false) enrollid++;
+		usedid = fps.CheckEnrolled(enrollid);
+		if (usedid==true) enrollid++;
 	}
 	fps.EnrollStart(enrollid);